Actually, that's been in ebay's TOS forever.
Here's the link to the terms:
http://pages.ebay.com/help/policies/user-agreement.html
And the pertinent part:
Legal Disputes
PLEASE READ THIS SECTION CAREFULLY. IT AFFECTS YOUR RIGHTS AND WILL HAVE A SUBSTANTIAL IMPACT ON HOW CLAIMS YOU AND EBAY HAVE AGAINST EACH OTHER ARE RESOLVED.
You and eBay agree that any claim or dispute at law or equity that has arisen, or may arise, between us relating in any way to or arising out of this or previous versions of the eBay User Agreement, your use of or access to the Services, or any products or services sold or purchased through the Services, will be resolved in accordance with the provisions set forth in this Legal Disputes Section.
*snip*
B. Agreement to Arbitrate
You and eBay each agree that any and all disputes or claims that have arisen, or may arise, between you and eBay relating in any way to or arising out of this or previous versions of the User Agreement, your use of or access to eBay's Services, or any products or services sold, offered, or purchased through eBay's Services shall be resolved exclusively through final and binding arbitration, rather than in court. Alternatively, you may assert your claims in small claims court, if your claims qualify and so long as the matter remains in such court and advances only on an individual (non-class, non-representative) basis. The Federal Arbitration Act governs the interpretation and enforcement of this Agreement to Arbitrate.
- Prohibition of Class and Representative Actions and Non-Individualized Relief
YOU AND EBAY AGREE THAT EACH OF US MAY BRING CLAIMS AGAINST THE OTHER ONLY ON AN INDIVIDUAL BASIS AND NOT AS A PLAINTIFF OR CLASS MEMBER IN ANY PURPORTED CLASS, OR REPRESENTATIVE OR PRIVATE ATTORNEY GENERAL ACTION OR PROCEEDING. UNLESS BOTH YOU AND EBAY AGREE OTHERWISE, THE ARBITRATOR MAY NOT CONSOLIDATE OR JOIN MORE THAN ONE PERSON'S OR PARTY'S CLAIMS, AND MAY NOT OTHERWISE PRESIDE OVER ANY FORM OF A CONSOLIDATED, REPRESENTATIVE, CLASS, OR PRIVATE ATTORNEY GENERAL ACTION OR PROCEEDING. ALSO, THE ARBITRATOR MAY AWARD RELIEF (INCLUDING MONETARY, INJUNCTIVE, AND DECLARATORY RELIEF) ONLY IN FAVOR OF THE INDIVIDUAL PARTY SEEKING RELIEF AND ONLY TO THE EXTENT NECESSARY TO PROVIDE RELIEF NECESSITATED BY THAT PARTY'S INDIVIDUAL CLAIM(S). ANY RELIEF AWARDED CANNOT AFFECT OTHER USERS. If a court decides that applicable law precludes enforcement of any of this paragraph's limitations as to a particular claim for relief, then that claim (and only that claim) must be severed from the arbitration and may be brought in court, subject to your and eBay's right to appeal the court's decision. All other claims will be arbitrated.
- Arbitration Procedures
Arbitration is more informal than a lawsuit in court. Arbitration uses a neutral arbitrator instead of a judge or jury, and court review of an arbitration award is very limited. However, an arbitrator can award the same damages and relief on an individual basis that a court can award to an individual. An arbitrator should apply the terms of the User Agreement as a court would. All issues are for the arbitrator to decide, except that issues relating to arbitrability, the scope or enforceability of this Agreement to Arbitrate, or the interpretation of Section 1 of this Agreement to Arbitrate ("Prohibition of Class and Representative Actions and Non-Individualized Relief"), shall be for a court of competent jurisdiction to decide.
The arbitration will be conducted by the American Arbitration Association ("AAA") under its rules and procedures, including the AAA's Consumer Arbitration Rules (as applicable), as modified by this Agreement to Arbitrate. The AAA's rules are available at www.adr.org or by calling the AAA at 1-800-778-7879. The use of the word "arbitrator" in this provision shall not be construed to prohibit more than one arbitrator from presiding over an arbitration; rather, the AAA's rules will govern the number of arbitrators that may preside over an arbitration conducted under this Agreement to Arbitrate.
A party who intends to seek arbitration must first send to the other, by certified mail, a completed form Notice of Dispute ("Notice"). You may download a form Notice here. The Notice to eBay should be sent to eBay Inc., Attn: Litigation Department, Re: Notice of Dispute, 583 W. eBay Way, Draper, UT 84020. eBay will send any Notice to you to the physical address we have on file associated with your eBay account; it is your responsibility to keep your physical address up to date. All information called for in the Notice must be provided, including a description of the nature and basis of the claims the party is asserting and the relief sought.
If you and eBay are unable to resolve the claims described in the Notice within 30 days after the Notice is sent, you or eBay may initiate arbitration proceedings. A form for initiating arbitration proceedings is available on the AAA's site at www.adr.org. In addition to filing this form with the AAA in accordance with its rules and procedures, the party initiating the arbitration must mail a copy of the completed form to the opposing party. You may send a copy to eBay at the following address: eBay, Inc. c/o CT Corporation System, 1108 E South Union Ave., Midvale, UT 84047. In the event eBay initiates an arbitration against you, it will send a copy of the completed form to the physical address we have on file associated with your eBay account. Any settlement offer made by you or eBay shall not be disclosed to the arbitrator.
The arbitration hearing shall be held in the county in which you reside or at another mutually agreed location. If the value of the relief sought is $10,000 or less, you or eBay may elect to have the arbitration conducted by telephone or based solely on written submissions, which election shall be binding on you and eBay subject to the arbitrator's discretion to require an in-person hearing, if the circumstances warrant. In cases where an in-person hearing is held, you and/or eBay may attend by telephone, unless the arbitrator requires otherwise.
The arbitrator will decide the substance of all claims in accordance with applicable law, including recognized principles of equity, and will honor all claims of privilege recognized by law. The arbitrator shall not be bound by rulings in prior arbitrations involving different users, but is bound by rulings in prior arbitrations involving the same eBay user to the extent required by applicable law. The arbitrator's award shall be final and binding and judgment on the award rendered by the arbitrator may be entered in any court having jurisdiction thereof.
- Costs of Arbitration
Payment of all filing, administration and arbitrator fees will be governed by the AAA's rules, unless otherwise stated in this Agreement to Arbitrate. If the value of the relief sought is $10,000 or less, at your request, eBay will pay all filing, administration, and arbitrator fees associated with the arbitration. Any request for payment of fees by eBay should be submitted by mail to the AAA along with your Demand for Arbitration and eBay will make arrangements to pay all necessary fees directly to the AAA. If (a) you willfully fail to comply with the Notice of Dispute requirement discussed above, or (b) in the event the arbitrator determines the claim(s) you assert in the arbitration to be frivolous, you agree to reimburse eBay for all fees associated with the arbitration paid by eBay on your behalf that you otherwise would be obligated to pay under the AAA's rules.