I was in Tokyo in 1993 and stayed in the Keio Plaza (sp?) (which I think is an Intercontinental). It was very nice.
On my flight this morning from LGA to PHX on American, the Keio Plaza had an ad in American Way. You could join their "club", which is free and receive reduced room rates, discount on breakfast, bonus dollars and most importantly -- 500 miles per night (yes, night) with American, United, and a 3 other airlines whose name I cant remember. You could join the club by calling the hotel (they have offices in NY and LA) or by returning the card in the back of the magazine. The ad was in the 1/16 AW magazine (I travelled this morning and the issues had not been changed in the plane yet). If the ad is in the current issue, I will try and post the information after I fly American on Wednesday.
-Jim