Developer works are running a fantastic article on how to use Ruby to mine Twitter for data. It comes complete with examples on how to find the locations of your followers, extract information about Twitter users, and looking at the behaviour of twitter users.
I received my copy of your fasitntac cookbook a few days ago and have dog-eared so many pages I don't know where to begin! I may just have to start at the beginning and work my way right through it! Congratulations on a wonderful book!Aimee