now that their license plates are on the web, why dont you start some kind of trendy-blog-spear campaign? if any of them were kerry supporters you should get "MY SUV <3 IRAQI OIL" bumper stickers. if the truck's tires were touching your car's body, that constitutes battery in some jurisdictions, call cops, you can press charges, etc. at least you can get a vandalism charge. i think i saw rickman's website had some "learn to park" stickers.
here's one that might be worth seeing the person's face. take a single round of ammo, a .357 is a nice size and intimidating. tape it to his windshield that way he cant miss it. attach a note that says "try it again" or "how are the kids?" or something to that effect.
-meGrimlock