TechNet Radio has 2 podcasts about SQL Server 2008

Part 1: industry experts Kimberly Tripp and Paul S. Randall about what is new in SQL 2008. Part One focuses on Security and Availability

Part 2: experts Kimberly Tripp and Paul S. Randal talk about what is new in SQL 2008. Part two focuses on Management, Troubleshooting and Throttling

Download part 1 here: http://download.microsoft.com/download/6/e/6/6e668f11-0e4b-40d1-9adb-084d5bb335a4/TechNetRadio03042008-web.wma

Download part 2 here: http://download.microsoft.com/download/e/5/4/e5440aa4-8fa1-44ad-acaf-e513d3b89026/TechNetRadio03112008-web.wma

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Greg Low has also added another podcast on his site. In this podcast SQL Server CAT team leader Lubor Kollar discusses the role of the CAT team, SQL Server 2008 resource governor and compression.
Download the podcast here: http://www.sqldownunder.com/PreviousShows/tabid/98/Default.aspx