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.
http://www.johnhpanos.com/tuts.htm

Rosauro Photography: Technical
http://www.rosaurophotography.com/html/technical6.html

Nadir shooting by Hans Nyberg
http://www.panoramas.dk/panorama/nadir/

Adjusting a panorama head for Optimal Stiching Position - by Smooth360
http://www.easypano.com/forum/display_topic_threads.asp?ForumID=1&TopicID=4162&PagePosition=1

Panoramic Lens Database
http://www.vrwave.com/panoramic/photography/lens_database.html

Panorama Calculator
http://www.hdrlabs.com/tools/panocalc.html

Cambridge in Colour - A Learning Community for Photographers
http://www.cambridgeincolour.com/


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
http://www.tactus360.com/examples.html

Eric Leeman—a perfectionist down to the last pixel
http://www.erikleeman.com/welcome-english.htm

Virtual Norge photographer, Marcin Kowalski—stunningly beautiful scenery
http://www.virtualnorge.com/preikestolen.php and http://www.virtualnorge.com/lysefjord_kjerag.php

Terry Montague at Regal 360—imaginative tours with all the bells and whistles
http://www.regal360.com/