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How many feeds are there? Is there a choice in what gets "fed" to me? Some might like a feed just of questions in their tagged list, while others might like to see all new questions. I'd go for new questions, but genuinely new.
What are the choices?
As far as I know, there are three types of feeds: the recent-questions-feed (http://mathoverflow.net/feeds), tag-feeds (like http://mathoverflow.net/feeds/tag/algebraic-geometry), and user-feeds (like http://mathoverflow.net/feeds/user/66). The Stack Overflow team has implemented feeds for all views (newest, featured, hot, highest-voted, active), but this hasn't been worked into Stack Exchange yet.
Oh, I forgot that there are also feeds for individual questions. See Tip number 9.
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