One is thanks to zudini. Cool. Here's the product page. I had a sort of similar setup at home: a recumbent exercise bike w/ a special laptop stand, but didn't end up using it much. The stand wasn't great, and biking is somewhat distracting.

Somehow, while I am not a fan of long, repetitive cardio (like jogging), I am a fan of long, repetitive cardio (like walking while working, AKA "Non-Exercise Activity Thermogenesis"). Maybe there's some cognitive dissonance, or maybe they are really different. I don't feel like thinking about it :).