as an owner of both i'll point out some of the good and bad for each:
*i noticed some frame rate stutters in SKATE, could be the only game, but i doubt it
*Warhawk, a major PS3 title is very hard to learn, i lost interest after the first time i played it simply because everybody was too advanced (even when i picked play my rank!)
*PS3 has blu-ray movies, obviously, wich are cool if u have an HDTV other wise, blu-rays are just expensive DVDs
*HAZE, Unreal Tournament 3, Killzone 2, and other great exclusive titles are coming soon, the PS3 is more futureproof IMHO. i expect an xbox 3 to come out before a PS4.
*basically does most things a computer can do
*Halo, Mass Effect, Gears(sucky game but ppl like it for some reason), other exclusive titles i cant think of atm.
*RROD issue is ellegedly solved
*LIVE is awesome, but expensive
*360 is a bit cheaper and you get a headset with it, but the removeable hard drive only supports 360 hard drives unlike teh PS3 wich can take any notebook hard drive.
*360 doesnt come with rechargable batteries like the PS3 does
overall, i like the PS3 and all but i have more fun on my xbox360, i'd tell you to get both if you could, it's a tough choice for me to make, i like the PS3 better.. but i think most other people like their 360s better.
maybe try gut instinct too, assign heads to xbox and tails to ps3, flip a coin, if it lands on xbox and you feel slightly disappointed, get a PS3, it may seem silly but it works most of the time.