Greg Reinacker's Marketing by RSS inspires me and others like Dwight and Derek to think about user-tracking for RSS feeds via HTTP Redirects when fetching the feed. One mind-twist seems to be the transfering of User-Ids (as object-ids, numeric values, integers or something like that)… why not use a simple name or e-Mail for user-tracking… and then let the user decide when he wants to use a new e-Mail. I guess assigning object-ids on the web is fine, but when it comes to identification I would hate something like a 3453465363 that's Christoph Cemper… the only type of autogenerated ID is my old 7-digit ICQ-Id … the only one !