Mobile Units of Work

I often find myself standing around with my phone for a few minutes wanting something to do, but I don't usually want a game! I need something like Amazon's Mechanical Turk to break work into tiny units of work, and let me do each bit in these spare moments.

Introduce a framework to distribute anyone's work (and money) to people with spare moments with their mobiles, and you have the Mobile Mechanical Turk!

What units of work are appropriate for the small screen and short windows of time? Surveys with only a few questions seem like a logical choice.

I guess plain RSS reading on the phone could serve my purposes, but this isn't really synchronized with my normal desktop reader, so there's the problem of overlap.