JustDecompile- New Free .NET Reverse Engineering Tool from Telerik
It blew up on XP for me, but works fine on Windows 7 64x.
Overview (from download site)
JustDecompile is a new, free developer productivity tool designed to enable easy .NET assembly browsing and decompiling. Currently available as a BETA, JustDecompile builds on years of experience in code analysis and development productivity originally created for JustCode, Telerik's Visual Studio productivity add-in. JustDecompile lets you effortlessly explore and analyze compiled .NET assemblies, decompiling code with the simple click of a button. Download the BETA and provide feedback in the Forums to help shape the official version, targeted for the Q2 2011 release this summer.
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Get it here.