How big should the banner be in 2.0?

I know that in 1.5, the maximum banner dimensions were 760px by 200px. I used the same sized banners for my wordpress 2.0 and they’re too big, but they don’t get cropped off like they did in 1.5.

Can someone tell me the exact pixel dimensions my banner should be to fit perfectly without going over or under the borders? Thanks.

PS – It looks the same in both IE and Firefox.