Open Source enabling a wide range of Data Warehousing technologies

Matthew Aslett posted a great blog post, explaining the Open Source influence on data warehousing yesterday. Talking about PostgreSQL and Ingres as the basis of many commercial datawarehouses (examples Netezza, Greenplum) he also mentions the first core warehouse software published under an open source license by Infobright. A lot has been happening recently in this scene and the article is a must read for everyone looking for an affordable technology in this space.