Gina at Lifehacker has created the #1 most important tool any Gmail user needs. It’s an add-in, called Better Gmail, combining all the major Greasemonkey hacks for Firefox-based Gmail users, and it turns Gmail from indispensable into … really indispensable.
I’m already using most of the pieces as discrete Greasemonkey hacks, but bundling them all like this is a work of genius. Just install it. Now.