http://stackoverflow.com/questions/1316852/alternative-to-memcached-that-can-persist-to-disk
Very interesting question that has lots of useful links on persistent object / value stores that are similar to memcache. Answer seems to be couchbase.
http://www.couchbase.com/products-and-services/memcached
This says it all, couchbase includes memcached as part of it, and can operate in "pure memcache" mode or can add persistence and other features behind memcached. Sounds like it'll do what we're after.
