Wiicade is a great site that collects flash based games that work well with the wiimote. You can access this site online at any PC or the Wii. I haven't visited the site in awhile but I remember the 3-D pong game being REALLY FUN. Crap I don't remember the name of it... CURVE BALL...!!! Oh and MISSLE 3D is really fun as well. Check them out http://www.wiicade.com/
yeh sorry, i didn't want to put a link to it, as I didn't know whether it would class as advertising/spam.
Its SUCH an addictive game. Its harder on the wii than with a mouse, but is VERy addictive.
And thanks to MrNiceguy and Skippy for following up with answers before me