A new obfuscator was brought to my attention: CliSecure by Secure Team.  The white paper on their site really makes it sound worth looking into (if for no other reason than to see what its doing):

… This is done by encrypting the IL code stored in your assemblies, during execution the code is handed to the jitter in its decrypted form just before compilation occurs.  The CliSecure execution engine assures that at most a single method will reside in memory in its decrypted form in any given time. This makes it impossible to reconstruct your original assembly even through the usage of memory dump tools …

Doesn’t that make you want to check it out? … certainly makes me curious.