Sounds pretty interesting. I can’t help but notice the slow but steady shift away from RDBMS into more flat file storage.
Be it memcached (free software, fucking awesom), Amazon’s Dynamo (non-released), Googls’ GFS/BigTable (non-released), the Lotus Notes (non-free ), Hadoop (free software) or CouchDB (free software) – there’s a lot of movement towards flat-file, file-system like, giant-hashtable-in-the-cloud type persistance layers.
By the way, CouchDB rocks.