This is a fairly minor annoyance. I subscribe to the forum Atom feed on Google Reader but it seems to be significantly delayed; I typically have to click "refresh" to get it to pull the latest Atom from http://www.skritter.com/forum/feed. I wonder if this has to do with header settings (cache expiration?) or if fixing it would require something like http://code.google.com/p/pubsubhubbub/
James