First off, I love WordPress. I love the customibility of the URIs. But I have a problem. I have it set up to where the links to posts is "archives/[year]/[post slug]" and I have some post subjects long enough to name emo songs such as, "While we’re at it… (Warning! Lots of [very very poorly] animated penises)" and "The second first is eleventh to last (My advice to you)". Those make for very very long URIs. They are hard to link to or for people to visit.
My question is whether there is a hack that will allow me to shorten the post slugs to the three or four first words of the subject without having to manually do it on each post. I thought about editing the .htaccess file but I cannot figure out how to get what I want. I would prefer a plugin or to edit my theme if anyone has any ideas.