These web sites have been very helpful to me when learning how to shoot panoramas.
Tutorials by John Houghton
John's tutorial on finding the no-parallax point is especially useful.
Rosauro Photography: Technical
Nadir shooting by Hans Nyberg
Adjusting a panorama head for Optimal Stiching Position - by Smooth360
Panoramic Lens Database
Cambridge in Colour - A Learning Community for Photographers
My browser's bookmark list of wonderful panorama web sites is several pages long, so it's a dangerous thing to single out only a few to list here. The work of these photographers has helped me learn about landscape panorama photography.
Tactus 360—Jon creates elegant tours of impeccable taste
Eric Leeman—a perfectionist down to the last pixel
Virtual Norge photographer, Marcin Kowalski—stunningly beautiful scenery
Terry Montague at Regal 360—imaginative tours with all the bells and whistles