And so it is that I've added a TypePad (via Friendster) and a WordPress blog to my collection of seven. Together with Gazzag and Yahoo 360, I'm up to 11, and MSN Live Spaces will make it an even dozen.
At this point, I'm just curious to try these out; actually maintaining twelve blogs is an exercise in futility beyond even the obsessions of yours truly. jereeza and others have mentioned that WordPress is good for judicious multi-blog posts, so I think I will use that for either my "writing ideas" or "project ideas" blog.