One twitter tool I have found facinating is monitter. The page has three columns where you can enter search words you want to monitor on twitter – your library name (or your name!) perhaps. Then as it finds tweets containing those words, the column will fill up and add those tweets as results.
I went immediately, added some location data and some keywords:
Of course, I see my tweets, but also some interesting things: folks discussing the Hesburgh library, our local CBS affiliate, and some discussion about my hometown Mishawaka, Indiana. Check this one out.