HBase is the Hadoop database. Use it when you need random, realtime read/write access to your Big Data. This project's goal is the hosting of very large tables -- billions of rows X millions of columns -- atop clusters of commodity hardware.
December 13th, HBase Hackathon: Coprocessor Edition
November 19th, Hadoop HUG in London is all about HBase
November 15-19th, Devoxx features HBase Training and multiple HBase presentations
October 12th, HBase-related presentations by core contributors and users at Hadoop World 2010
October 11th, HUG-NYC: HBase User Group NYC Edition (Night before Hadoop World)