Easy, touchpad-playable game?

Have you tried Scribblenauts Unlimited? It's a pretty fun game and doesn't require anything more then a touchpad. The only negative thing about it I can think of is that it doesn't go on sale very often. Other then that, it's awesome!

Scribblenauts

Or you could get a controller :) I always play with it when im in bed :)

I don't really know this game, but would Castle crashers be a good idea? It seems like a fun beat 'em up.

i don't want to be mean but wtf is a "toupad"?:))

Minecraft has a touchscreen mode I've never tried, go give it a try!

Based on past experiences with the demo, I'd say World of Goo (unless you already have it on something else).

Old Point n'click games. (with ScummVM) :D
The Dig
Full Throttle
Day of the Tentacle
Sam & Max
Monkey Island

If I recall correctly Legend of Grimrock had a touchpad option in settings. Might be worth checking out, and its on sale for the next few hours too.