Has this ever happened to you? You are typing a command and cannot remember 
whether that particular option is an "u" or an "o". cmdlinehelp to the 
rescue!

When editing a command line, press <c-o> (see also |g:cmdlinehelpMapView|) 
to display help on the command currently being edited.

Use <c-pageup>/<c-pagedown> to scroll the help window.

This plugin was inspired by a post by Marcel Boon to vim_use:
http://groups.google.com/group/vim_use/browse_frm/thread/aaa3d652d7b76d02


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Status:  Works for me (there may be some minor quirks)
Install: See http://github.com/tomtom/vimtlib/blob/master/INSTALL.TXT
See http://github.com/tomtom for related plugins.