I started installation of Windows Phone 7 SDK from this link over my machine
- Windows 7
- x64 dual proc
- 2GB RAM.
- Visual Studio 2010 professional
- Office 2010.
The download of 322 MB completed fairly quickly. The installation took more than an hour. Phew!!! Even my OS (windows 7) installation was quicker than that.
I hope this experience gets improved. Anyways now I shall write my first app :).