Call me the novella kid. That seems to be the only thing I want to write these days. I woke up at three am this morning and worked on one until 10 am, then I took a nap. I just really like stories in this size. The problem with novellas is they're bigger than short stories and shorter than novels--the unwanted bastard stepchild of literature. With luck there will soon be another novella on the literary landscape.
Two of my favorite stories were novellas. White Fang by Jack London and A Christmas Carol by Charles Dickens [both stories were later dramatized]. They were both huge sellers that have never gone out of print since fist introduced and they were both novellas.
Alas, this size story is not very common today. There are a few around, including my own Legends of the Dragon Cowboys, which is actually two novellas in one book.