tweetbeaver.com/

TweetBeaver gathers data on any non-private account and returns most searches as a csv for easier filtering and analysis. The available functions include:
– convert @name to ID (or vice versa)
– check if two accounts follow each other
– download a user timeline
– download a user’s friends list
– finds common friends of two accounts
– get a user’s account data

LINK: http://tweetbeaver.com/