I've run into it, in the sense that I used to work with someone who used it, but I've never actually used it myself.
I probably should learn a bit about it though, incase I find jobs people that want me to know it, so I'll go read up on it.
If you see me on MSN then feel free to ask about it... can't promise I'll give good help, but I can give things from a different perspective which might be enough.