This was a google talk bot that allows you to track tweets around a certain keyword that you have registered for.
It should be easy to setup the database with the SQL files provided, or you can use the script
You would need 2 XMPP accounts buzz@domain.com feeder@domain.com
You will need to add one account to the other manually. After that you should be able to add buzz@domain.com and register for keywords you want tweets from. Have not tested this lately, should still work.
Feel free to mail me at dipankarsarkar@gmail.com in case you need more help!