We do have our own in office Windows domain that I use, but need something that I can take on the road.
A couple of trains of thought.
One would be a utility that emulates LDAP, or creates a mini-LDAP server.
Alternately, some kind of virtualisation deployment, perhaps using a ready-made virtual image that has a LDAP server as part of it's image.
I already have a number of VMWare images running MS Server 2003 + AD, but don't really want to spin out another 2003 server clone as I believe it will cost me another license ?