How long is the PS3's charge cable compared to the Xbox 360's? Well, watch the video to find out. Ok, done?
As you can see, the PS3's cable is only five feet long, not nearly far enough for anyone to use while playing. It's only a "charge" cable—unless you want to sit up close and incur the wrath of mothers everywhere—as opposed to Xbox 360's "play and charge" cable. Just something to keep in mind.
Update: You could also theoretically plug the PS3 controller into a laptop, a powered USB hub or an Xbox 360 sitting next to you on the couch, but that's a kludge.