There is a little information throughout this thread (youll have to search through) with the different covers people have.
Kindle 3 - 8/27 release date. Anyone Pre-order?
I have the cover that gacats (above) posted. I like it, but don't love it. The light is nice and I really like it on flights. I find airplane lights just aren't enough so having a light that pops out is nice. It's also nice to be lighted since I used to carry an attached light for my old kindle which I constantly lost or the battery would die. This one uses your kindle to charge (the battery still lasts forever). The case is very compact and stylish. My only complaint is that there is no pocket. I can't believe they didn't include a pocket. But I would agree, this is the best cover I've seen so far.