as much as I love Amarillo and Simcoe, perhaps this will be good for the brewing community in the sense that they are becoming almost ubiquitous in the AIPA and APA offerings. Now brewers will be forced to be creative once again. Seeing this thread has made me realize how much I have crutched on these two hops in almost all of my american ales over the past 2 years - I'm kinda looking forward to the change.
HD has some new ones on their site (Calypso, Rainier IIRC).
Perhaps experiment with some oldies but goodies as late hops - Chinook comes to mind. SSoS is a pretty good recipe and its EKG and Chinook IIRC. Celebration doesn't suck either.
Keith - IIRC, isn't your standard IPA Magnum, Columbus and Centennial anyways?