I am definately most interested in the Revolution, but the PS3 is looking nice too. Revolution with full backwards compatiblility with all Nintendo consoles built in, plus new online content is going to rule. PS3 backward compatible was a big surprise too and there are a lot of good games available at launch for Revolution and PS3 just due to their back catalogs.
PS3 looks to offer the most in terms of hardware specification and will also have very strong publisher support as usual, the PSP and DS connectivity of both systems is going to be important too. I am quite happy with what I am seeing from Nintendo and Sony this time around. 2006 will be an exciting year in gaming that's for sure. :)