The main feed I would like is for my inbox, would also like one for “All Topics”. I don’t think it would be necessary to have seperate feeds for Bugs\Features\Questions, because you could add that to the category of each message and if people wanted them seperated they could use their feed reader to filter them. All Topics feed should be for when new topics are created only, not topic updates.
As for topics updates I think a subscribe button should be added, with the option to send updates to my inbox or email address. The updates should be the same as the one you currently get in your inbox if you create\contribute to a topic.
Feeds for tags would be unnecessary IMHO.
That covers everything I can think of right now, anyone else got some ideas?
Edit:
For email updates I think ebr’s design would work better.
yes, seperate feeds would be best.
I see three feeds:
just some thoughts:
an inbox feed would require you to be logged in. as far as i can see i'm always logged on automatically so that shouldn’t be a problem allthough it might have some unexpected behaviour if people delete cookies and such
the topic feed sould not include replies/comments so you're not overloaded with “useless” information
the subscribed topics could be useful if you haven’t commented on a topic because you have nothing useful to say, but still want to folow the topic. this feed would include all replies/comments for your subscribed topics.