Shared directories in Ubuntu using ACLs

A nifty article on how to use ACLs in Ubuntu to share directories effectively between user accounts.

http://brunogirin.blogspot.com.au/2010/03/shared-folders-in-ubuntu-with-setgid.html

I read in another blog on the way to the above link, that Ubuntu has a fairly prescriptive user permissions model, and I just wish they'd spell out what it is... Instead, users and administrators are left to pull together blogs, like this...