Thanks for the suggestions! I'll check those out. 
PC games only, yeah. I'm shooting for a mini kiddie LAN party. I have lots of PCs and only one Wii. 
The Sonic All Star Racing Transformed looks promising, but it's not clear if it's strictly Internet multi-player or can do LAN. I've read as much as they offer on the site, but they don't mention details. I guess tech specs are dull to their constituency.
Disney shoulda designed Sugar Rush as multi-player and sold it. I'da bought it.