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Gmail is by far the handiest email program out there, but many of its cool features are hidden and not so obvious to the average user (particularly those who think Hotmail is still awesome). Thanks to Lifehacker, they are continuously informing their readers of all the tricks, hacks, and tidbits to get the most out of Gmail. For a good starting point of Gmail tricks and tools, start with the monster roundup here.
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For Firefox Users (isn't everyone?): Lifehacker has helped develop a great Firefox extension called Better Gmail that has a whole bunch of great Gmail features. It is packed with stuff, so it is easy to get overwhelmed. Adam from Lifehacker made a good video tutorial on supercharging Gmail that I thought was well done.
Get the most out of Gmail, it has a lot to offer.