Interesting press release from Netezza here:
http://www.netezza.com/releases/2009/release010609.htm
At the moment it only looks like there’s an OLE DB provider available, but the release says this is only the first part of the strategy. I wonder if Netezza is being considered as a supported data source for Analysis Services so it could be used with cubes in ROLAP mode, as with Teradata today?