During my last round of Rss feed pruning, I finally deleted weblogs.asp.net (it's been a long time coming).  Too many of the following:

• Duplicate posts about the same news item.
• Posts linking to other posts on weblogs.asp.net essentially saying "yeah me too" or "so-and-so posted about the following."
• Posts that are locale specific (i.e. speaker in blah part of the country type stuff).
• AJAX related fluff posts.

I'd say out of 20 posts, maybe 1 of them actually piques any interest from me anymore.  Nothing against the bloggers who are aggregated over there, but it's run its course...for me at least.  I'm individually subscribed to a handful of bloggers from there that I'll continue to read.  I'm also down to under 100 feeds I read on a regular basis.