If you follow the Public Store, you're about to see a change in the RSS Feed. Back when I first started publishing that, the feed generator didn't produce a GUID for the items. Most aggregators simulate one under those circumstances, but the information that most of them use (often the link) wasn't going to work out so well here - the link for each item in this case is the same.

So, I've gone ahead and added a GUID. The downside is, on the first round of updates, you'll see a bunch of "new" items that aren't actually new - but it should behave better over time.