The verb estar when it doesn't mean to be

http://spanish.about.com/od/usingparticularverbs/a/uses_for_estar.htm

About.com daily email has a short lesson today that I find useful, because of the many uses of the verb estar.   It is also worth signing up for the about.com website for the daily email.  Thanks to blog reader Chip who made this recommendation to me several months ago.  Now if I could just learn the correct usage of the "to be" verbs!