"How To Start Using Twitter To Grow Your Business"
To Download Twitter Workshop Slides CLICK HERE

Finding Followers and Who's Following You
Mr. Tweet
DoesFollow
FriendOrFollow
Twellow
We Follow  
Who Should I Follow
Find Local Twitter Users
Probable Follow

Twitter Client Applications

URL Shorteners
bit.ly
Ow.ly
TinyURL

Twitter Background Tools
TwitBacks   
MyTweetSpace
Free Twitter Designer
Free Twitter Backgrounds
Create a Twitter Background Using Powerpoint or Keynote
Specs for Twitter Backgrounds

Useful Twitter Websites
Search on Twitter   
Backtweets
Twitpic
Twitter on Facebook

Hashtags
Hashtags
Tagalus

Articles
50 Ideas on Using Twitter for Business
All The Twitter Apps You'll Ever Need
Top Twitter Management Tools

Books
Twitter Power: How to Dominate Your Market One Tweet at a Time, by Joel Comm
The Twitter Book, by Tim O'Reilly and Sarah Milstein
Twitter For Dummies, by Laura Fitton, Michael Gruen, and Leslie Poston
Twitter Tips, Tricks, and Tweets, by Paul McFedries and Pete Cashmore