This old Tao post (I found via HawkWings) outlines a filing system using Mail.app and IMAP to replace Yojimbo.
I use Mail.app with a few plugins (Mail Badger, SignatureProfiler, Mail Type Select, still waiting for Mail Act-On) and a plethora of smart mailboxes. So using Mail to store digital snippets is intriguing.
But after nine-point-six seconds of thought, I realized that Mail won't do it for me. Journler (or Evernote) are waaay better than Mail and/or Yojimbo.
Why am I still rocking the Journler? In 1000 words...