IronKey is one of a number of USB thumb drive-based ways of protecting your PC.
IronKey has military-grade cryptography and uses this to ringfence sensitive data and applications stored on it. It can be used with insecure wireless networks, since any data sent from it is automatically encrypted using an FIPS 140-2 compliant True Random Number Generator for maximum protection. So there.
IronKey comes in three versions: Basic, Personal and Enterprise. The Personal version, suitable for home users, offers a password manager, a secure backup tool and a Flash Trash feature that thoroughly deletes files by making them self-destruct.
Sold through authorised dealers in the UK, IronKey USB thumb drive security products come in capacities of 1GB to 8GB and start from around £50.
For full details of how it forms a fortress around your PC, see Ironkey.com.