Johan Oskarsson has organized a meetup for folks interested in distributed structured data storage and is calling it NOSQL. The event, being held June 11th in San Fransisco, will have subject matter experts presenting on Hypertable, HBase, Voldemort, Dynomite, and Cassandra.
There were 100 slots available slots to attend and they all went in a matter of hours, so if this is the first you've heard of it, it's probably too late. Fortunately I got mine and thanks to the support of my employer I'll be there. I'm looking forward to it.