I also usually have a "*" or "%" playlist at the top of the stack for "in progress" lists that I don't finish in one sitting.
[robg adds: Folders in both iTunes and iPhoto would be greatly appreciated as a means of reducing the visual clutter in both programs. I don't do much with iTunes playlists ('select 300 random based on not played within last three weeks' is the only one I actually have!), but I would really welcome them in iPhoto, where I have nearly 100 albums.]

