This space just got more interesting with IBM's intention to acquire Netezza this morning.  Read more here:

Lots happening in this space.  Previously, Microsoft bought DataAllegro, SAP bought Sybase, Teradata bought Kickfire, EMC bought Greenplum, and now IBM is buying Netezza.  Data warehousing and analytics is a big area.  Oracle on Thursday last week announced they have a 1.5 billion dollar sale pipeline for their Exadata database machine and last night at Oracle OpenWorld, Larry Ellison announced the Exalogic Elastic Cloud machine to complement the Exadata database machine.