In the interest of sharing ideas about source code control and 
versioning systems, have y'all seen this recent update on freshmeat for 
a package called Monotone?

It bills itself as a secure, distributed version control system.  It 
resembles Monticello in that any repository can sync with any other 
repository, and each package in a repository knows it's version history 
with other repositories.  It adds further functionality like delta 
merging within files and source trees, secure hashing (with SHA1) of 
source trees and file contents to ensure package integrity, and the use 
of certificates with RSA encryption to authenticate authors of changes.

Although today we get buy just fine without being overly concerned with 
security in our sharing of source, someday that might not be the case.  
Anyway, interesting stuff. :)