Dont forget bivio!

[metaperl]

If you really want to see a clean MVC system, you must take a look at Bivio and join the mialing list.

They have an online petshop demo with View source functionality.

[tphyahoo]

Could you comment on the relative strengths and weaknesses of bivio versus your Seamstress?

UPDATE: Metaperl has mentioned bivio in The Bivio Model and Algorithm for Authorization (slides available), where he notes that he initially intended to base Seamstress on it. But then he decided not to because even after intensive study bivio strained his powers of understanding.