The 8GB model of IronKey secure USB drive just announced recently. It means double the size its last model which has only 4GB capacity. Designed with military level of security, all user data inside the drive is encrypted. $299.
If a thief tries to break into an IronKey and exceeds a policy-determined number of failed login attempts, the IronKey Cryptochip will lock out the encryption functions and securely erase all the encrypted data with its patent-pending Flash Trash technology.