Flexbeta.net is the first on the scene with an official download link to Windows Media Player 10 Technical preview. "Windows Media Player 10 is being refined to provide a great experience for discovering, playing, and taking your digital media anywhere. We are still in the early stages, but this technical beta lays the groundwork for the great end-to-end digital media experience coming with the final release for Windows XP."
Read more for download link...

http://download.microsoft.com/download/4/E/3/4E3F5D77-0A63-43E3-91C4-9396B3A1EF19/MP10Setup.exe