I just published the first draft of a GreaseMonkey script for Twitter. I tweet frequently http://twitter.com/hising and sometimes I do it via the web (using Firefox) and there are some things I have come to be really annoyed about, first that the web do not automagically link hashtags to their search.So the first thing I did was to add this functionality. Next is to add extra functionality for following and grabbing status about tweeters in your list.

FrontEndBook.com Twitter Enhancer GreaseMonkey script on UserScripts