No official annoucement for Device support in Silverlight 3 yet. If not in version 3, kindly understand the limitations of CoreCLR of Silverlight, so security and various other concerns are there, so need to wait, right not I guess it is not also provided by any third party too.
Lets wait untill final annoucement of Silverlight 3 RTW
Thanks,
Vikram Pendse.
Microsoft MVP
http://pendsevikram.blogspot.com