I used to use WordPress on my own site (I recently took it down, but now I guess I'll put it back up *sigh*). There's an add on for it called "FeedWordPress" that's a pretty good aggregator for things you want to put *in* to your WordPress Blog. The only thing is that you have to manually tell it to look for the feeds (although, you can set it up to do it automatically, but I'm not that web saavy).

I don't know if that helps at all, but that's all I know...