Search Cloudlet is a plugin for Firefox that adds relevant tag clouds to searches you conduct using Yahoo! or Google. We first looked at the program a few months ago and were impressed with the way it helps refine your searches.
Now there's a new version of Search Cloudlet that works with Twitter search as well. When you conduct a search using Twitter, a tag cloud will pop up with relevant terms. For example, if you search for "Jim Cramer," you'll find a lot of results for "Jon" and "Stewart."
You can also filter your results by clicking ont he Authors, @To, or #Tags buttons. Or if you'd rather not see the tag cloud at all, just hit the Off button.