Yoggie Pico: Linux-based Personal Security Device
Yoggie releases yoggie Pico, a USB thumbdrive-sized Linux-based device that provides an extra level of protection for your portable computers running Windows-OS. The device serves as a gateway where all internet traffic passes through and get analyzed and filter as necessary. It is far better than a software-based solution, of course… knowing how Windows is so vulnerable and all. 
To know exactly how it works, head to their website and see for yourself.
Again, prevention is better than cure.
(image captured from Yoggie's website. apologies)