Top Twitter Tools & Resources Resource Center 

You may have a lot of followers on Twitter, but just how valuable are they? This application will check the number of followers of everyone on your contact list, the number of people they are following, and the ratio between them.

For example, examine 1,000 of your contacts and find those who have a following to followers ratio of 1:5. The more followers they have the more important they are. Thus you can cull your followers list quickly and efficiently.

Twist lets you assess Twitter trends by comparing one keyword versus another (for example, BlackBerry vs. iPhone). The results appear on a graph, and you can choose to view the last week, the last month or for all time.

Big brands are using Twitter to communicate with their customers, constituents, etc. Here is a very large list. It includes links to each Twitter profile page. In addition to artists, media luminaries and such you will find M&Ms, JetBlue, Delta, Amazon, Buy.com, Woot and more. Are your competitors already using Twitter? Go here to find out.

Segment your tweet messages to specific followers. Simply create a group, assign followers to that group, and then send group messages. A very useful marketing tool when you need to graduate beyond "one-size-fits-all" messaging.

Repurpose your blog posts by feeding them directly to Twitter.

There are hundreds of Twitter tools out there. This directory is very comprehensive. It divides all the tools into categories such as mobile applications, cross-platform tools, posting enhancement tools and more.