Automatic ZFS snapshots?

Sun has created a utility that lets you manage automated snaphots, as  
detailed here: http://blogs.sun.com/timf/entry/ 
zfs_automatic_snapshots_now_with

Has anyone looked into a method to accomplish something similar on  
the FreeBSD port?
A lot of the value in snaphots lie in the .zfs directories where  
users can fish out backups of their damaged or deleted files without  
help from an admin - but for this to work there has to be a system in  
place that makes new snaphots on a schedule, and also purges the  
snaphots that have become too old.

This is probably going to require some fancy scripting, so i'm  
curious if anyone has made a set of scripts to do it on freebsd yet?  
It's probably not possible to port over this thing sun made since  
it's a plugin for their solaris service control system...


-Sverre