My favorite security measures are along the line of "shaming" users. Let's face it, crackers weren't going to buy your product anyway, but perhaps casual users who think it's OK or "not really stealing" can be shamed into buying or at least not stealing anymore if you show a big splash screen at startup, displaying the licensed user's name, company, etc.
Anyway, what I wouldn't give to have developed a product that people thought well enough about to crack.