Drag the following link to your toolbar, click it when you see code on a page:

Prettify!

credit:

google: http://code.google.com/p/google-code-prettify/
I added a bunch of SQL keywords (all lower and all CAPS). works ok, but better than nothing.

Mike Purvis (for the bookmarklet - i added "pre", he only had "code"): http://sandbox.mikepurvis.com/js/prettify/