20-minute comedies

Though as much as I would like to, I simply lack the time to watch forty-minute medical/vampire/sci-fi dramas everyday.

I did actually stop watching anything for a while to make time for reading after I get back from work, but I've realized I need a bit of TV to unwind and forget about the work gaffes (which are too many these days, unfortunately).

I've always liked the shorter stuff, especially if it's funny, like How I Met Your Mother and The Big Bang Theory. These sitcoms totally cheer my evenings up. I think it's just the sort of stuff I need after a hard day's work, and since the episodes are not more than 20 minutes, I can still make time for other stuff.

Anyone's got suggestions on good comedy shows that have short-duration episodes?

Thanks much!