I'll buy it to play Dance games with my grilfriend and some fitness titles

I love motion controls so any inclusion in certain games will make me want to play it more.  since I'll be getting a PS3 this holiday, move sweetens the deal.

Both, The old game is getting patched to work with move, and they are releasing a "move edition" 

thanks

I am getting it for some fun party games, but I also hope Move will make a RTS gaming on console a reality, I love my RTS on the PC, but so far RTS on the console has felt painful and clumsy. So I both hope R.U.S.E with Move turns out to be a great experience and that a lot of people end up buying it, because that could open up for Starcraft 2 to come to the PS3 Move :)

because I can

I'm getting it because GameStop has it for cheap for pre-order and I want to play Heavy Rain, LBP2, echochrome ii, Ape Escape and Sorcery with Move for now.

SOCOM, Sorcery, Heavy Rain, KZ3. Interesting note: I read in GameInformer that Sony was working on the PS Move since like 2004, but couldn't get the glowing ball thing to work properly and the LEDs were too expensive at the time. I wonder what each company is working on now that might be coming out in 6 years......

EDIT - Correction, they started working on it as early as 2001 before the original Eyetoy.