[Alan Turing]

I'm already familiar with Polymorphic Shellcode, XOR Values, Obfuscation, sending bits of the payload out of order so IDSes can't reconstruct them, fragmenting packets, slowing packets down for volumetric IDSes, and delaying packets over a long period of time.
No unicode conversion or instruction reversals either.
But what other methods are there? I don't care how advanced, would give me something nice to read up on.