I found an interesting article on slashdot talking about a new technology that will further lockdown .NET applications. From this initial article this looks like a promising new technology.

"One area of research is called "Program State Code Protection,” or PSCP, which means changing the code AS IT RUNS to make it harder for a cracker to know what is actually happening. Dotfuscator and DashO, for example, right now change all variable names to the same name. But what if all variable names were changed not just to the same name, but were changed continuously to a wide variety of names? The first technique -– making all the variable names the same -– is like building a jigsaw puzzle entirely of white pieces. But PSCP is like making a jigsaw puzzle of all white pieces that spontaneously and continuously appear to change size and shape."

http://www.pbs.org/cringely/pulpit/pulpit20040219.html