I currently use Gmail as many of you out there do, and have been for some time now. I just realized however that I am a “GMail master”. See what level of Gmail user you are, and learn a thing or two in the process.
For example, check out the search tips video to find emails your looking for more easily:
Sean Shadmand 
See a list of search options for google mail
such as has:attachement and more
http://mail.google.com/support/bin/answer.py?hl=en&answer=7190