Remix hits all the good points. I myself am an avid 360 owner and player. However, that said, I do plan to buy the PS3 - once they come out with some games I want for it. WipEout PS3 is one of them. I don't feel that PS3 is dead, for geez, it's only been out for - what? - two months? What were the launch titles for the 360? Remember everyone bitching about how the 360 sucks because it has no games? I myself had a 360 and played Hexic till the break of dawn (baby got it goin' on) - until finally about 5 months later OBLIVION came out. I still only own four games.
Yeah, there will be games that have become non-exclusive, but, ...whatever.
So, what I am saying is - if you are strapped for cash and don't want to wait, then sure go trade it for a 360. But, if you can handle the money - keep it and get a 360 too.
Also, as for getting the PS3 for 'free online gaming'. Well, on this one I have to slap your wrist for not doing enough research... If THAT'S why you chose the system, then, uh... hummmmm.... 360 is $400 + 4
years of XBLive = $200. Then $400+$200 = $600 ...or a PS3. That's just the simple math.

That's to speak nothing about the impending charges that individual software companies are going to charge to play on their servers - as opposed to XBLive where the structure is all there and complete.
I digress...