I have been submitting my RSS feed for my podcast to various directories, only to find they are not being updated as they should be.
My feed is: http://audiolingo.org/?feed=rss2 (I'm running Mac OSX 10.3.9.)
I recently updated from WP 1.5 to 1.5.3, but this was happening before that. In fact, I updated primarily because I thought it might clear up the problem, but it didn't.
The feed validates, by the way.