Microsoft has released an interim build of Windows Vista, Build 5342, today to a select group of testers. This is the first build to come with the 'real' Aero Glass: fully scalable vector based transparencies that take advantage of pixel shading. The previous builds contained Aero Express and Aero Express with transparancy, not the real Aero Glass. Other notable improvements: a complete firewall, support for Pocket PC 2000, 2002, and 2003 synchronization, and more. Flexbeta has screenshots, but Flexbeta seems pretty down to me at the moment.