Windows XP SP2 (or above) or Windows Vista SP1
Other OS are planned for future versions
JDK 1.5.0_11 (or above)
Eclipse Ganymede : any of the following Eclipse standard disctribution
Eclipse Basic 3.4.1
Eclipse IDE for Java Developers
Eclipse IDE for Java EE Developers (Recommended)
.Net Framework 3.5 (or above)
Use the Bootstrapper Installer
Or download the full redistributable package dotnetfx35.exe and run it
Silverlight 2 Runtime (2.0.31005.0 or above)
Go to this page http://silverlight.net/GetStarted/, at the right side, click on the "Window runtime". M1 release of eclipse4SL doesn't support other platforms yet.
Silverlight 2 SDK