> I wish Emacs came builtin with a mode to edit CSS style files.

Indeed!

> There are several floating around the net and I have my own (see
> below).

I had two issues trying to use your css-mode.el:

1. looks like the `css-nmchar-re' and `css-nmstart-re' definitions are
   messed up (patch attached).

2. `prog-mode' in not defined in my Emacs. Where does it come from?

> I don't really care which one is installed, but I just hope one of
> them makes it into Emacs-22.

Seconded.

-- 
Edward O'Connor
hober0@gmail.com

Ense petit placidam sub libertate quietem.