Wireless guitar works with PS2 and PS3 versions of Rock Band

So you've decided to buy
Rock Band this December, but for some reason you're going to nab the PS2 version, complete with wireless guitar. All of a sudden, you inherit a PS3. What do you do? Apparently, you shrug and use the guitar on the PS3, as it will be compatible with either the PS2 or PS3 version of the game. Since the drum and microphone use the same USB interface, it's assumed they'll work in the same way.
Another reason to buy the PS2 version -- it comes with a USB hub. If you're getting the new 40GB PS3 (which has 2 USB ports instead of 4) and the PS3 version of the game, it doesn't have a hub bundled in. It's a strange thing that could get overlooked, but knowledge is power and with power, you can rock. With friends!