Technet Plus and MSDN subscribers already have access to the Windows 7 Beta download. However, something they are reporting issues with is getting the activations keys for the download. This means that, while they can download and install the product, they are not able to activate it. The good news, though, is that much like Vista, you can run it for 30 days without activation. So, sometime this afternoon, if your so inclined you can try to download Windows 7 from here. Afterwards, you have up to 30 days to get your activation key and go through product activation.