Ages ago, I proposed that the best CMS for a company would be one which used e-mail as the front-end:

- all attachments are stripped out and stored on a server in an hierarchical structure based on sender/recipient/subject line

- all discussions are archived based on similar criteria, and can be reviewed EDIT: and edited like to a wiki

My one concern there would be edits: a CMS needs to support easily making edits to content (fixing typos etc) - editing existing posts via email sounds like it would be pretty fiddly.

Ha! I had the exact same idea! I still think it would be nice.