Before rolling my own RSS parser, is there a really good open-source parser already written for C#?
Check these tools i was asking for: http://stackoverflow.com/questions/635719/how-to-read-all-shared-google-reader-feeds-by-code
Seems like the RSS.NET library is worth a try. It does seem to be reasonably complete. And judging by the code examples, it seems very easy to use.
Edit: I was looking for this earlier but couldn't find it for some reason... RSS syndication is now in fact built into the .NET Framework 3.5 as part of WCF. See this MSDN magazine article for an introduction (scroll down for the section about the syndication API). Also see the answer to this SO thread.
I recently used FeedDotNet from codeplex. It was very simple to use, took very little time to get working.
There's one called Argotic Syndication Framework
If I were to roll my own, I would probably use this one as a reference.