Panda USB Vaccine
Full user review
"Works as advertised"
* Makes "autorun.inf" on vaccinated pendrives inaccessible to any software, thus breaking the main mechanism virus use to spread themselves from machine to machine;
* Disables Windows' autorun feature, protecting it from unvaccinated pendrives.
* Viruses can still infect your files, thus the need to scan the device with an anti-virus before running installed portable applications or opening files remains;
* Any "autorun.inf" becomes forbidden, even if you want it (e.g., PortableApps.com).
It does what it's supposed to do, and does it well. There isn't much more to say. Download it and start using it, you won't regret it!