Finally Microsoft has put together its act and made Windows 7 Beta available for download (along with the product keys). No secret links are required, just visit the official Windows 7 site and get the product key and the ISO of Windows 7 Beta. 
You will need a Passport ID to login. Also Firefox is not supported for the download. You will need IE 7 and above to download the ISO. Thats because MS uses an Active X Control as a download manager to resume downloads.
Internet Explorer 7 and Internet Explorer 8 Beta 2 support the Windows 7 Beta download experience. Please note that Internet Explorer 8 Beta 2 users behind a proxy server should use the automatic configuration for their proxy server for the best download experience.
It is good that MS has extended the availability of Windows 7 Beta till 24th January. Hopefully the 3.15 GB x64 ISO will have finished downloading by then on my computer.
P.S. – I have a 160 kbps unlimited internet connection. 