Nice Links Thomas!
Personally speaking, one of my favourite areas for landscape photography are the Canyons and national parks around SouthWest USA. There's also some fantastic hiking opportunities there too if you're into that kind of thing - Zion and Bryce Canyons really stand out and there's some photos in our Canon 5D gallery at:
One of the best photographers of the SW USA area is Michael Fatali, who's website is here: http://www.fatali.com/
He's understandably discreet about some of his exact locations, but having hunted around the region, I can highly recommend Lower Antelope Canyon, just near to Lake Powell and Page in Utah. When the sunlight enters this narrow slot canyon, the colours and textures are simply awesome!
I'm not sure if Fatali was in Antelope Canyon for his shots, but his portfolio section lebelled Stone Cathederals gives you a good idea of what's there.
Here's one I did on a visit myself...