You may recall Hirameki International, a company we’ve discussed several times which brings Japanese PC games to the US market, on Windows and DVD formats (depending). They’ve recently released Ever17 and Ai Yori Aoshi from KID. Incidentally, you can get demos of both of those games’ US versions here.
That aside, Hirameki has a user survey up, which asks fans to submit information about what titles they’re interested in. Perhaps if enough people ask for Fate/Stay Night (english translated website here), they’ll bring it over? Hard to say. As a cautionary note, be aware that the form must be followed exactly – never put in more than three choices in any category. If the form is improperly filled, you lose all of your entered data and must start over. Thanks to Isaac Alexander for pointing this survey out.