I have not personally owned this one, but ATP's ToughDrive seems to fit the bill for rugged EDC.

It's rubber coated, water resistant, dust and electrostatic discharge-proof (don't see claims of ESD-proof often with thumb drives), fast USB 2.0 interface, and allows internal drive partitioning and password protection. The 512 mb model is $50 direct from ATP. Might find it cheaper elsewhere.