According to MajorNelson’s twitter feed the preview program for the Xbox 360 NXE dashboard additions has gone live. Follow the link below and fill out your details to sign up for the chance to be one of thousands of early testers of the previously reported improvements.
You’ll need to know your console’s Serial number and Console ID as well as have your Gamertag to hand but the whole process is fairly straightforward and very well explained. I’ve just finished signing up myself. The program is open to both Gold and Silver subscribers but they will be giving preference to those that pay for their service.