Ken Hyder blogs about 14 Tools of Highly Effective Twitter Users, including the following:

• Follow Cost
• hashtags
• tweet stats
• Tweetake (for backup)
• Twitpic
• Grader

Then Daily SEO Blog has 10 Twitter tools to effectively manage your followers, like:

• Who’s following me?
• Mr Tweet- who’s interesting?
• Mr Cleanr

In more Twitter / Social Media news, CIO.com has article about how SalesForce.com has embraced both Twitter and Facebook. Add in a healthy API with Broadsoft for Voice Applications and a hook to Google Apps and you can see why SalesForce.com has become the first billion dollar SAAS company.