http://www.espguitars.com/news/news_guitarrig.html
Just spotted this on the ESP website, in case anyone fancies turning their PC into an awesome sounding Amp Simulator, and winning a LTD KH-602 at the same time.
This is the 2 Go version, which I guess is a stripped down version of GR3 but if you've not used guitar rig before then here's a good chance to have a play.
For the full version, you need a fairly decent soundcard to keep the latency and has to have an ASIO2 interface, whether that is the case for the "2 Go" version I don't know.
Only one way to find out.
l8rz
Scott