I started a wiki page for those wishing to let people in the community know about projects/products that integrate with Cassandra.
http://wiki.apache.org/cassandra/IntegrationPoints So far listed there are projects like Hadoop (including Pig and hive), Solr/Lucene, Flume, and Scribe. If you work on or are aware of such projects or products, consider adding it to the list. Please just try to keep the descriptions free of too much marketing or things like that. It's simply meant to help people know about the integration.
