Here’s a post from the Netflix Tech blog talking about their usage of NOsql technologies including Amazon SimpleDB, Hadoop, HBase, and Cassandra. Of special interest was the mention of Datastax, a company offering commercial support for Cassandra.
Here’s a post from Joydeep Sen Sarma about the combo of Hbase and Mapreduce.
A lot is happening these days with open source solutions to data problems and PostgreSQL and Hadoop are both at the center of the solutions. Each offers unique capabilities. Tim Sell from Last.fm has put together some information about how the two can be used together. Check out the slides and video.