Read this in MacWorld - a way to organize your email. Just use three boxes:
Action includes stuff you need to deal with a.s.a.p.
Filed, stuff you want to keep.
Later, stuff you that may or may not require attention but doesn't need it right this moment.
That's it! The way filters work nowadays you can easily locate an email and so no need for putting a file from X person in X file. I'm going to give it a whirl. Sounds promising!