I'll just say this. Given that I got my PS3 out a pure right place/right time/right circumstance, and given that I could have traded in for a 360, at the suggestion of a GameStop employee, I'm glad I didn't. Sure, there's games I would love to play on the 360, but apart from the price tag on the 80 GB unit, the PS3 really is a nice system.
Right now what it has going for it:
Uncharted: Drake's Fortune
Ratchet & Clank Future: Tools of Destruction
Resistance: Fall of Man
MotorStorm (wasn't too fond of it at first, but now it's grown on me.)
Folklore
Heavenly Sword (I wouldn't ever in a million years pay $60 for this game, but definitely worth a rental)
Eye of Judgment (if you like card games), not to mention there are some cool PSN titles priced at $2 that are way fun to play around with the EYE camera
Not to mention, if you're in the market for a Blu-Ray player at all, once the Firmware 2.20 patch comes out in a few days the PS3 will be the only thing on the market until late this year or early next year that will play Profile 2.0 (or BD Live - DLC for movies I believe, something like that mainly), although the no 2.0 movies are out yet so whatever on that right this moment.
When you look at the exclusives PS3 will be getting this year, it's definitely going to be a contender as far as large install bases go. It won't by far catch up to XBL by any means, this year, or probably next, but I suppose anything is possible.
Lined up this year:
Gran Turismo 5 Prologue - $40, only a few tracks, and maybe 60 cars, but it will be a taste of what's to come in the full GT5 later this year. AND it's already hit near 1,000,000 pre-orders (in Europe, but still).
Metal Gear Solid 4 - YES.
&
Metal Gear Online - Again, YES.
Resistance 2: A full 8 player Co-op campaign to complement the single player, and 60 player online.
Little Big Planet - Could be the most overhyped game of the year, but it seems to keep people talking.
HOME - This is what could pull them up to compete with XBL if it stays FREE and ends up not being a huge piece of junk (so far it's look way cool to me)
As far as the next few years, who knows? 2009? God of War 3 and Final Fantasy XIII and POSSIBLY Versus XIII (as far as I know, the end of 2009 would be the earliest either game is out though)
Hopefully this didn't come off as some crazy fanboy post, but the PS3 has a lot to offer at this point, and looks like it will only get better and I didn't see too many in-depth "here is what Sony can offer YOU for your money" posts. So, all in all, I'm happy with my PS3, and while I definitely want a 360, I wouldn't give up the PS3 to get one. Ever.