The Grazr Twitter Reader is built on an open API, which means that you can call the individual components used by the reader directly. Each of the API calls accepts a Twitter username and returns either an RSS feed or OPML as indicated:

• Top level OPML. http://app.grazr.com/api/twitter/reader/[username]
  Returns an OPML file with profile information for the user, and nodes for their timelines, friends network, and a search form for other networks of friends. Any user that has an account on Twittergram.com will also be given a feed node listing their Twittergrams. ( sample )
• Top level OPML without search. http://app.grazr.com/api/twitter//friends_nosearch/[username]
  Returns an OPML file for the user with all information, but without the search form. ( sample )
• Friends OPML. http://app.grazr.com/api/twitter/lriends_list/[username]
  Returns an OPML file with one folder for each person the user is following. The Twitter API restricts this to a maximum of 100 people. ( sample )
• User timeline. http://app.grazr.com/api/twitter/user_timeline/[username]
  Returns an RSS file with the most recent posts by that user. Note: The Twitter API sometimes limits this to just the most recent post when traffic on the site is heavy. ( sample )
• Friends timeline. http://app.grazr.com/api/twitter/friends_timeline/[username]
  Returns an RSS file with the most recent posts by that user and the people being followed. ( sample )

This API was inspired by Tom Morris' Twitter Friends script.