As much as i like VI, I must be honest; I am not going to remember all these funky commands. I have gathered these links below to help people out whenever they forget let’s the command to display the line numbers for example:
http://www.colorado.edu/ITS/docs/unix/vi.html
http://www.cs.rit.edu/~cslab/vi.html
http://www.cs.fsu.edu/general/vimanual.html
http://osr600doc.sco.com/en/FD_create/vi_summary.html
http://www.tuxfiles.org/linuxhelp/vimcheat.html