Now AMD's Dave Orton is saying that R600 has UVD:

"AMD's Dave Orton told the press that attended the Press Conference that the ATI Radeon HD 2900 XT in deed does UVD, but due to the power full shader engine in the GPU, it is done in software rather than in hardware as is the case with the HD 2600 and HD 2400 series."

http://www.tweaktown.com/computex2007/13/index.html