Originally Posted by Noodle
Weren't some of the Di Gi Charat books 4-koma? I know the Broccoli ones weren't, but there were 2 volumes put out by IronCat and 4 others by VIZ. I might be mistaken though, as it's been an awfully long time since I read them, and you can't find them too easily now...
I have the first two volumes by VIZ. Between the two, there's only a 4 page 4koma story about a trip to hot springs; less than some random 4koma omake in a regular manga series, really. Though I can't speak for the other volumes.