Windows VSTs in Ardour (via wineasio and Reaper)
For people looking to use VSTs with Ardour, this is the answer you need.
Instructions are here:
Basically, you run Reaper(a DAW made by the creators of Winamp) and use wineasio, which will connect to JACK. From there, you use it like any other JACK application.
So there you have it. Windows VSTs running with JACK.
I read on a discussion thread somewhere that this setup had latency of about 10ms, which I'm sure is good enough for a lot of people. Of course, I don't know their hardware setup, but at least we have a ballpark figure.