If you have read Getting Things Done, there is a workflow for processing your inbox. Well I replicated this workflow in an Omnigraffle document. I am not the best at Omnigraffle yet, but it looks pretty nice.
I could not compress that file small enough to attach it, so I uploaded a jpeg to my flickr account:
http://flickr.com/photos/89419289@N00/2513212646/
Enjoy and let me know what you think...
Cheers
Joe
PS. I would be happy to send anyone the OmniGraffle file if you like.