New to .Net, need help in identifying obfuscator

[pablo]

Hello, I'm new to .Net reverse engineering. I have some experience in reverse engineering of native applications, but .Net is a totally different story to me.
This is the application in question: http://www.filesend.net/download.php?f=f85bc7b161be0259bb3e7126cb355050 I've tried several unpackers/dumpers/deobfuscators with no luck. Would you please tell how to deal with it?

[pablo]

Reflector shows
http://img25.imageshack.us/img25/2070/reflectedectune.jpg

and crashes if I click on a method.
All strings inside are base64 encoded.

Any pointers?