I feel in love with the grease monkey plugin for firefox, the first time i used it. For a script-lover like me, the ability to use or even quickly write scripts that will change the way my not-so-favourite websites look or behave was mind-blowing.
Just when i thought it couldnt get better, i ran into Platypus, another firefox plugin that lets you do away with the 'scripting bit' by letting you visually make changes to a web page and then save it as a grease monkey script. See Using Platypus page for more details. What more could you ask for!
My kudos to the ingenuity of both the plugin writers! Watch this space for my humble contribution in form of some scripts :)