I like org-mode addon that is now included at the beginning of emacs version 22. The following are some commands that I wanted to have for reference: Org-mode commands:

action keys
hide everything C-c C-t
show everything C-c C-a
show children C-c C-i
show subtree C-c C-s
hide subtree C-c C-d
show body of current heading C-c C-e
hide body of current heading C-c C-c
show branches (heading tree) C-c C-k
hide leaves C-c C-l
hide sublevels C-c C-q
hide others C-c C-o
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