Directory of repository-related blogs
Worth taking a look and suggesting additional feeds if they are missing.
They provide an OPML file which means that everything listed here should be aggregatable (is that a word!?) but I had a quick go using Yahoo Pipes and failed miserably I'm afraid to say. Not sure if that is my fault or not but I seem to recall having problems before with large OPML files in Yahoo Pipes so perhaps there is some built-in limitation?