Yeah, dumb on my part, openswan is the ipsec one.

What's running on the serverside that you guys are trying to connect to? I was reading it as though you're looking for an end-to-end kind of solution originally. Openswan has info on their wiki for using the toolset to connect to different vendor's implementations and the native windows ipsec for xp sp2+ is always an option on the windows boxes. Sounds like you're looking for an actual purpose-built client though.

Any luck with shrewsoft so far?