Tweetburner - track your links with this tool

This one is great for tracking your links that you have sent out, see if a campaign is working or not???
web: http://tweetburner.com/     
twitter: http://www.twitter.com/tweetburner

Twitter Twerp Scan - contact management tool

Contact Management Tool that can tell you if tweeple are only following alot to get more followers. It will also allow you to find out who's following you and who you're following back, then make adjustments accordingly
web: http://twerpscan.com/en     twitter: http://twitter.com/twerpscan

Scott Stratten & UnMarketing

Scott Stratten & Un-Marketing for twitter!

From one of the leading experts in viral and social marketing-market your business effectively to today's customers
For generations, marketing has been hypocritical. We've been taught to market to others in ways we hate being marketed to (cold-calling, flyers, ads, etc.). So why do we still keep trying the same stale marketing moves?
UnMarketing shows you how to unlearn the old ways and consistently attract and engage the right customers. You'll stop just pushing out your message and praying that it sticks somewhere. Potential and current customers want to be listened to, validated, and have a platform to be heard-especially online. With UnMarketing, you'll create such a relationship with your customers, and make yourself the logical choice for their needs.

• Shows how to create a mindset and systems to roll out a new, 21st century marketing approach
• Marketing expert Scott Stratten focuses on a Pull & Stay method (pulling your market towards you and staying/engaging with them, leading them to naturally choose you for their needs) rather than Push & Pray
• Redefines marketing as all points of engagement between a company and its customers, not just a single boxed-in activity
  Traditional marketing methods are leading to diminishing returns and disaffected customers. The answer? Stop marketing, start UnMarketing!

http://twitter.com/unmarketing