I like aggregated feeds because there are occasionally new people that have valuable content to provide. I hate aggregated feeds because you can't separate the good from the bad without losing the ability to see new authors. With this, I'd like to see the ability to ignore certain authors in aggregated feeds. This would also save the the annoyance of having to deal with posts in languages I don't know. Of all the requests I have for Bloglines, this is perhaps the one I'd like to see implemented the most.