I updated my feed-abstract gem to support twitter RSS/Atom, in that it will automatically parse hashtags and turn them into RSS item subjects/categories. Huzzah! This is pretty fun, as it allows tweets to be aggregated into TagTeam seamlessly and they can be remixed, archived, and searched by tag.
You can get at twitter RSS/Atom via URLs like:
https://search.twitter.com/search.atom?q=url encoded hashtag
I’m sure there are more search parameters available too. If you want RSS, just change the “.atom” to “.rss”.