I've been fiddling around with a freakishly terrible Outlook calendar adapter for Blogwave. It's truly awful, though at the moment I'm not sure if it's me or Outlook.
Anyway, at the moment it's pretty close to being nonfunctional (no, that's not a typo) and as I was working on it on Friday, I hit a persistent problem with BlogWave not liking the RSS produced by my component. ("Object reference not set..." errors- but with no trace information! Bah!)
Addy helpfully suggested that it would probably be best to try building a test harness with the RSS.Net component as that's what's used to process the adapter output, and whap - problem solved. Whereas the BlogWave Adapter UI is happy to treat URLs as "just text", RSS.Net wants them to be System.Uri s, and they have to exist too (while troubleshooting, I tried omitting item links entirely (among other things), and that just abjectly failed as well).
Still, problem solved, now back to fighting with the Outlook object model ("the fun bit")!