I've been doing a series that is quasi-autobiographical, in that it contains not my real experiences but my real fantasies and things I (kind of) wish I had done. My next installment in that series is longer than the rest, and is taking quite a while to work out.
I have another short series (hard to tell if it will go much beyond two or three volumes) that I'm working on vol. 2 for; it's about a middle-aged man and his surprising encounters with his cousin and extended family. The second in this series, too, is very long—at least, much longer than the first volume.
Then I have a couple of other ideas that I'm working out. I always seem to have more ideas than I have time to put them into words!