Uh-oh.. Bloglines + Weblogs Inc = Clusterfuck.. again
I love Bloglines, and I subscribe to many blogs in the Weblogs, Inc. family. Around Christmas, I noticed that entries from Weblogs, Inc blogs, such as Joystiq, Engadget, and others would duplicate, triplicate, on and on. I lodged a compliant to the CEO (since the contact forms were broken on many of the sites), and after a few days of torture, it was fixed. Now, it's back again. Is it just me? Are other aggregators doing this? It's driving me crazy.

Thunderbird does this from time to time, (I still have a few feeds I monitor personally).
I have an installation of Gregarius however, that does it RIGHT.
Posts have a guid (or... at least they should) for a reason.
If a post is 'new' or 'changed' from cache, and has the same guid, UPDATE THE POST YOU ALREADY HAVE WITH THE SAME GUID!
Dupes are worthless, but the case of some things where you have to edit the original post, just update that post, don't make an ENTIRELY NEW one.
[/feed soapbox]
Side note: Does the guid element exist in RDF, RSS0.92, And Atom?
Just wondering if you knew.