I don't know what kind of stuff you could have to hide that you'd need this level of security, but if you're an insanely secretive person, the IronKey might be right up your alley. Billed as the world's most secure flash drive, the IronKey features military-grade AES hardware-based encryption to keep your data as safe as possible. In addition to that, if someone tries to break in and tries the wrong password 10 times, the drive will self-destruct, destroying all data on board and rendering it completely unrecoverable.
And you can use it for more than just hiding porn, too. You can also use it with Firefox to secure your browsing experience, protecting yourself from malware and browsing in complete stealth. Consider it the paranoid's best friend. Prices run between $79 for a 1GB model to $149 for a 4GB model.