"With the large amount of space it offers, and the amazing features the possibilities are endless. The filter feature is easily the best feature of GMail. You can use it for its purpose - to filter spam and other unwanted emails. Or use it in some unique ways such as bookmarking, and storing recipes. Here are some nifty hacks/tips that allow you to get the most out of your GMail account..."
GMail based blog
Encrypt all GMail traffic
Make a GMail partition
Linux on GMail
gDisk for Macintosh
and more...
click
GMail Hacks/Tips for details.