If you've wanted to use the PlayStation 4's (arguably superior) DualShock 4 controller with a PS3, you've so far had to plug it in; that's not easy if your couch and TV are at opposite ends of the living room. It's a good thing, then, that Sony has quietly enabled wireless support for the newer DualShock through its latest PS3 firmware update. It's still treated as a generic controller without motion or vibration, and game compatibility is somewhat spotty, but it's now relatively safe to ditch the USB cable while playing. You can check out Reddit's instructions for pairing the gamepad with your PS3 at the source link, and here's hoping that it eventually gets first-class treatment.
Sony PlayStation 3 (late 2012)
Sony PlayStation 4