The best basic *nix text around IMHO is "Linux for Dummies" quick reference, YMMV,...and they have a nicely laid out basic "vi" cheatsheet.
vi rulez - emacs droolz...LOL...for all the newly minted *nix enthusiasts, the vi versus emacs debate is one of the oldest and dearest flame wars ever. I suspect it might even be the subject of the first flame war