.NET Mass Downloader
With the ms release of sourcecode in msi files, netmassdownloader became somehow absolute, you can still use it for your express editions, but for vs2010 there is no longer a need to use netmassdownloader.
Just download the sourcecode from referencesourcecode.microsoft.com.
Welcome to the .NET Mass Downloader project. While it’s great that Microsoft has released the .NET Reference Source Code, you can only get it one file at a time while you’re debugging. If you’d like to batch download it for reading or to populate the cache, you’d have to write a program that instantiated and called each method in the Framework Class Library. Fortunately, .NET Mass Downloader comes to the rescue!
Mass Downloader For the .Net Framework which allows you do download .Net Framework source code in batch mode.
The tool which enables offline debugging of .Net Framework in VS2010 , VS2008 (including Express Editions) , VS2005 (including Express Editions), and Codegear Rad Studio.
Reference Source Server is up again.
Check The Documentation Section For The Usage Details.