This is a long shot, but it can't hurt to ask

I'm looking for a piece of software which can emulate an 802.1x compatible switch so I can set up test labs in Virtual PC without having to mess about with expensive hardware.

Not sure if such a beast exists, but it would be really handy - I have the Supplicant (XP) and Authentication Server (2003 w/IAS & CA) components sorted, just need the Authenticator for a full virtual wired EAP-TLS setup.