Adam Pash over Lifehacker has done a post on Gmail quick tips. Those are the tips really could improve your way of using Gmail. Tips include setting up labels, filters, search through emails, managing multiple email accounts with Gmail, using shortcuts and macro script and much more:
… Despite my undying love for Gmail, there are still a lot of people who aren’t won over by sheer enthusiasm alone, and still others who just aren’t taking full advantage of the features and functions they’ve got at their fingertips in Gmail. Either way, the only thing a Gmail naysayer needs is a better understanding of everything you can do with Gmail.
Today I’ve got a rundown of the methods and add-ons I use to make Gmail more powerful. By the time you’re done with this article you’ll be a bona fide Gmail power user, too…
Hack Attack: Become a Gmail master – [Lifehacker]