Check it out, the WiiLinux team already figure out how to get WiiMote to actually work on your computer.
UPDATE: Playing Half Life 2 with WiiMote.
Also you are NOT required to have a sensor bar to use the wiimote. The sensor bar is only used for pointer feature and the video use only the tilt features like the PS3 controller. Also it's possible to run Windows applications on a Mac: http://www.apple.com/macosx/bootcamp/