A while back some of my readers warned me that SharePointPlan.com's RSS and XML feeds weren't working properly. After a lot of debugging while watching "Enterprise" reruns, I came to the conclusion that:
Enterprise was the best of the Trek franchises.
Feedburner feeds don't work if you write your article in MS Word.
Google bought out Feedburner recently.
Items two and three may be related! :-) Nah, I'm sure its pure coincidence.
Anyway I found the offending tag and deleted it throughout my blog posts, so the feeds should work fine now.