With XBOX360 you have to subscribe and pay to be able to game on XBox Live.
But, as skidiot.h shows, you can "obtain" it other ways.
;-)
There are pros and cons to both systems and I speak that I have both systems. I haven't played games on my PC since Counter Strike 1.6 days (along with Blizzard's Starcraft+Broodwar Expansion) Since then I had an OG XBOX, never went online, had mine modchipped as well as did softmods for others ($40 = softmodd your xbox with 10 games of your choice or modchip your XBOX for $100 +10 Games your choice)
Anyways. I would highly suggest console gaming as PC gaming's kind of died down. Yes there's still a market for it, but meh PS3/XBOX360 is the way to go.
Don't know which one to buy?
PS3:
Pros:
*Great for Solo Gameplay
*Bluray
*Media
*Free to play online as well as other services (hulu/netflix)
*Full Browser
Cons:
*Lack of Multiplayer Games
XBox 360:
Pros:
*Lots of Games
*Great for everyone of all ages
*Xfinity (pretty much turn your console into an on demand cable box
Cons:
*Pay to play online
*Need to be Gold to watch netflix/hulu/xfinity
So it really depends on what you're going to be doing with the console. If you want it for gaming with your friends get the XBox 360 (Using some special coupons, no need to pay for online play/other goodies)
If you want to enjoy a collection of movies, music, tv shows, etc. and single player gaming I would go with the PS3
But hey thats my $0.02