Doctor!
If you happen to be in possession of a Wii and a friend -- and I'm pretty sure both can be acquired on ebay -- you really can't go wrong with Trauma Center: New Blood. It's hard to convey in words just how much fun 2-person co-op surgery is... that is, as long as it's a virtual body that you're horribly mis-stitching and filling full of laser holes.
Just be warned that, like all the Trauma Center titles, New Blood stars as a good time and ends as an outrageously brutal, white-knuckled marathon of abuse. I imagine I will really appreciate having that second player to help me when I'm fighting against the purple alien heart spiders (or whatever other bizarro sci-fi ailment Atlus came up with this time). I'm not 100 percent on this, but by the final stages these games may actually be more difficult than real surgery.
Sam Logan
PS: No, not really. Hyperbole, man!