Evergreen:
I don't know of a good site for reading about Czech glass. Dusan at this site
http://picasaweb.google.com/exat53?feat=content_notification has a very good collection of photographs of Czech pieces. Then there are two books, Marcus Newhall, Sklo Union, for a very good and comprehensive account WWII Czech pressed glass, and Mark Hill for a general overview of post WW II Czech glass plus a good selection of photographs on glass like this as well as pressed glass. Another book is Helmut Ricke, Czech Glass, which deals predominantly with the pieces of glass I could never afford.
Hope this helps, and I also hope somebody can jump in and suggest some other sites.
David