Michelle Mangen has a helpful post on the V3 Marketing Blog at: http://www.v3im.com/2011/03/7-keyword-search-tools-for-twitter/#axzz1Hx6...

Here's the post:

7 Keyword Search Tools for Twitter

Posted by Michelle Mangen on March 28, 2011

Read more: http://www.v3im.com/2011/03/7-keyword-search-tools-for-twitter/#ixzz1Hx9...
With many businesses using Twitter as part of their social media marketing efforts, conducting Twitter keyword searches can be beneficial for several different reasons:

Identifying influencers
Finding people on Twitter