I have success using the embedded (core, common + persistence jars) version via jpype (Java API), I will try to prototype an adapter, if I will have success I will inform you
It has all in one: - key value store - document database - graph database - object database http://code.google.com/p/orient/wiki/JavaAPI and embedded version doesn't seem to eat little memmory (<25 Mb python + jvm), so it usable even on my memory limited webfaction account :) (80 Mb for now)
