[mbucc]

This tutorial is a good intro: http://blog.gopheracademy.com/cron-filesystem/

The Plan 9 web pages are really good (if dense).

If you write in Go, check out github.com/rminnich/go9p.

For a deep dive, "A Cached WORM File System" is a good read [http://doc.cat-v.org/plan_9/misc/cw/].