I'll be dead in 2100. What do I care about 4-digit years in URLs? "2005" is ugly, but "05" -- the sleek lines! the primal indivisibility! -- is beautiful! Or at least tolerable. Less intolerable.
I like the two digit years, alright?
Get it here.
Put it in your plugins folder. If you are using WordPress 1.5.x, you may need to regenerate your rewrite rules.