The only regional restriction with Steam is pricing.
Online MP play doesn't really work with anyone though.
No it works, I've played many games with these guys before. Its just that we were all in the States at that time. Although admittedly it does sometimes seem like fighting an invisable dragon with nothing but spoon and two pieces of paper would be easier than getting steam to work properly...
anyway, guess i'll find out for sure tonight. Thanks for the reply