From the Site:
I just created a new Twitter account, and it got me to thinking about all the data visualization I've seen for Twitter tweets. I felt like I'd seen a lot, and it turns out there are quite a few. Here they are grouped into four categories - network diagrams, maps, analytics, and abstract.
See the List
Twitter Marketing: An Hour a Day
The Tao of Twitter: Changing your life and business 140 characters at a time
Twitter Marketing For Dummies (For Dummies (Business & Personal Finance))