How many friends are you really following? Twitoria finds your friends that haven't tweeted in a long time so you can give them the boot!
great collection of rated tools or twitter
"under the Preferences tab you can do things like change your Twitter username and password, update your auto follow settings, or turn off auto responders from other sites entirely! Be sure to add spammy users to our blacklist there, as we'll do something really cool with this later." Also offers some premium services.
"The Twoxit Twitter Widget / Twitter Tool allows anyone to place a twitter update box on their website / blog for their visitors to update twitter from. This could be a great benefit to you as you will be encouraging your website / blog visitors to update their twitter profile, possibly about your website / blog! Simply copy the code for a form below and paste into your blog / website source code - Done!"