Powerset is hosting the first user group meeting for HBase, a robust, scalable, distributed, column-oriented store capable of hosting billions of row of sparse, structured data. HBase is open source and part of the Hadoop project.
Definitely come if you're a current user of HBase; or if your company has plans for a huge data store and you're evaluating solutions.
See the event on upcoming.org to sign up.
Yahoo! Developer Network