“Gmail works well for me. I use it almost exclusively, even
forwarding emails sent to my other addresses to my Google mail
account. I like its labeling function and the tightly integrated
chat feature that saves each conversation in the mail archives. But
recently, I discovered a few Greasemonkey scripts that make Gmail
even better.“In case you haven’t heard of it, Greasemonkey is a plugin for
Firefox that lets you quickly install and run scripts that change
the content of selected Web sites. The scripts download and install
in seconds, and make it easy to tweak your most visited
sites…”