Jake at Photoblogs asks if we loose a way of telling a story by using single-shot photoblogs rather than multi-shot. So here's why I do single:
The picture I choose best represent my mood, feelings, thoughts and/or highlights of the day. Doing multiple shots I feel would be saying too much. By going through the shots day by day, perhaps you'll get to know me well, but by multiple shots you'll have no idea what I most want to focus on as I'm probably all over the place.
Secondly, of course, is the time issue. I don't get to take that many good pictures as I'm still learning. And processing them takes time. Time comes coupled with space: I don't have unlimited with space to publish everything. (although some would say I'm fairly close