Open Source Removable Media Encryption?

An anonymous reader asks: "I'm trying to find a solution for encrypting removable media connected to my network's computers. Ideally, the solution would: allow Enterprise deployment and configuration in a Windows XP environment; be free and open source; not require administrative privileges to use (encrypt/decrypt files and media); and allow decryption via freely available and platform-independent methods on the destination machine. I've looked at PointSec for Removable Media, but it requires Windows on both ends. I've also looked at TrueCrypt, but it doesn't appear to limit encryption to only removable media (I don't want users encrypting their hard drives). Slashdot, can you help me?"