Replace the "new" vB3 smileys with the "old" vB2 smileys on http://boards.straightdope.com. The script is completely self-contained, with all images included. I tried to make it as upgrade-proof as possible.

It might work on other vBulletin forums, but you'll have to manually change the "include" settings to include your forum URL. It should work on at least vBulletin 3.x, but no promises.