I have been using .Net Reflector for almost 4 years now and this really is a cool tool to just go decompile assemblies when you need to, and this was one of the tool I used to decompile some of the assemblies provided by Microsoft to see what's going in the internals.
It was a bit fishy when Reflector was bought by Ants, and gradually as you all might know, Reflector is no longer free, and whats worse the free version will cease to function after May 30th this year.
Enter Telerik, Telerik as promised to release there JustDecompile tool to the public as FREE, this tool gives you almost all the feature .Net Reflector provides.
You can download the beta version from here...
Below shows a screen shot of JustDecompile