I requested Dalmatien leather for my birkin in feb. @FSH, the SA told me no it hasen't been done for some years (3-5 years I think he said). =( =( If it ever gets revived I'll make a prompt order. And pop the champagne. I love the look of it.
I don't think it can be ordered anymore; best bet would probably be the reseller route.
Various combinations include black/grey, white/grey, white/black, white/red, white/orange, white/olive, etc.
Buffalo skipper leather is extremely durable, and is the same leather used on the toile/leather combos for the garden party totes. In the black/grey combination (same color shown in the Birkin in Liberte's post), I have no issues taking it out in rainy weather--it is very hearty and thick and is a workhorse. The white background dalmation, however can be prone to yellowing as indicated in Jemznjewel's listing for the Web above.