Gmail's search operators are resemble those of Windows Desktop Search. I suppose we're heading towards some kind of convergence.
The interesting ones are:
- to: (obvious)
- has:attachment (more useful than one might think)
- in:anywhere (when it might be in spam filter or trash)
- after: and before: (dates are yyyy/mm/dd - my favorite date format!)
- OR: yes, Google has introduced the Boolean OR. At long last ...