I bet some of you have already heard of it, but this is a pretty good resource for everyone interested in reverse engineering, obfuscation techniques, malware analysis and bending the possibilities of what you can do with Portable Executables. I found it while researching for my master thesis:
https://code.google.com/p/corkami/downloads/listThe most benefit I see is in the example binaries provided. So if you are developing a tool or need examples to exercise reverse engineering, this is the right place. There is a zip file with the most odd PE files you can ever imagine. They break usual tools viewing the PE format, but run on Windows nevertheless as the Windows loader doesn't care about the PE specification that much.
