I've been experimenting with Plagger for creating a personal planet sort of thing. It works pretty well. It seems very flexible but it is hard to figure out how to really take advantage of all the options and "plugability". For example, I wanted to change the title of some of the individual feeds. Eventually I figured out that if you use the explicit method of defining a feed, rather than the typical url only shortcut, you can specify the title. Like this:
- url: http://rss.whatever... title: This is a title
