As another follow-up on the RSS / aggregator discussion, David asks about an RSS framework.
I think they're actually trying to do this as an off-shoot of the RSSBandit project - abstracting out some of the specifics of dealing with an RSS feed. I don't know all the details or the status etc, but you can check out the RssComponents workspace for more information.
Whether or not the various aggregators choose to leverage such a framework is another question. It seems some teams at Microsoft are starting to embrace RSS, so maybe we can turn to them on this. Ideally, these abstractions would be included in the BCL itself (doubtful). The next best thing would be to have the framework provided and evangelized by Microsoft, as I think many developers would be more likely to use it.
Either way, I think it's a great idea. If and when I were to ever build my own aggregator, I definitely hope to have something like this available.
[ Just as a side note, I spend the past few years doing framework development, so maybe I'm a little biased. I just think the right abstractions can really add a lot of value, and this is definitely an appropriate place for such an abstraction... ]