Cheap but useful gadgets - 8gb Key Shaped USB Drive

This cost me £4.20. An equivalent would have cost roughly £15. This was obviously an eBay special from hong kong. It's almost certainly USB 2.0 as the speed was fine when transferring big files.

I like to keep a few utile on mine such as xubuntu live and a disk wiper which will completely zero the hard drive and completely eradicate any sign of secure information or dodgy photos you may have on there. That is a must if you're selling a PC. You don't want a dodgy criminal stealing your identity.