PS3 for nine years. I think the 7 that the PS2 lasted is more realistic. Both Microsoft and Nintendo came out with superior hardware last time, but were unable to make a DENT in Sony's marketshare. PS2 developers simply poured their hearts and souls into digging out every last ounce of power the PS2 had. They dug in their heels and, in the end, the PS2 came out on top.
I can see that happening this time around too. Especially with the new 40 gig system going for 399.99. That's exactly what I paid for my 360 (in Vegas) last year. So now "price" is becoming less of a stretch of the imagination. Particularly when you see that a $349 360 is going to charge you $49 for Xbox Live Gold and you'll wind-up right back at $400 anyway.
And, as far as PC gaming goes, all that fancy hardware will never matter again because more and more game publishers program on Consoles instead of PCs. Crysis is the only PC exclusive game I can think of in recent memory. UT3, Call of Duty 4, even the F'N Orange Box... All of them were on consoles. Then there's all the games that are only on Console.