In last Thursday's IRC meeting I agreed to type up some thoughts on the cache management API and how it relates to the multiple image locations blueprint. I put my thoughts here: https://tropicaldevel.wordpress.com/2013/04/09/free-cache/ I apologize that it got a little bit long winded. For the tl;dr version skip to the "A Proposal" section. I look forward to talking with you about them in the next meeting! Thanks, John