I'm so surprised nobody has mentioned the game Trauma Center: Second Opinion on this forum as a great reason for buying the Wii. I love it so much that...well just look at my avatar! It's like playing that Milton Bradley game operation but with fancy 3d graphics and a killer soundtrack and the storyline is kinda cool too. But wow...just using that wiimote to do surgical procedures with the nunchuk to select tools...its just a testament to the ingenuity in store for the wii. Go rent it!
Oh and a sequel came out a few months ago. Trauma Center: New Blood. Haven't played it but seems pretty cool too. And if anyone out there has a Nintendo DS, yes Trauma Center Under the Knife also gives you a chance to live out your surgeon dreams with the DS stylus. I wish they would make more games like this that was medically related.