Want an RSS feed for a particular Twitter user? This used to be linked off the profile page(s) but since disappeared. It’s still available if you know where it is:
http://api.twitter.com/1/statuses/user_timeline.rss?screen_name={username}
Replace {username}
with a username (example).
You could also put a bunch of users into a list and query that using:
http://api.twitter.com/1/lists/statuses.atom?slug={listName}&owner_screen_name={username}&include_entities=true
Replace {username}
with the list owners username and {listName}
with the list name (example). Strangely that’s only available in atom format.
I still find RSS handy for those accounts I don’t want in my stream but want to keep an eye on, as well as those I want to programmatically access or manipulate.