Everything USB reviewed the Corsair Flash Voyager 512MB.

The Flash Voyager (512MB reviewed), encased in a rubberized case, proves to be more practical than plastic or brushed titanium. First, its elastic body can absorb any shock resulted from a drop, protecting the USB connector and the NAND memory from harms. It is also immune from any scratches due to the nature of the material. Moreover, the leak-free case ensures drive is water-resistant. That only leaves the USB connector exposed when the cap is removed. Even though most flash drives would survive a submerge, but you would need to wait for them to dry first.

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