Little update for those of you that are curious:
I called the man a little later that day. The conversation went a little something like this:
Hi, is Ken ***** there?
This is Ken.
This is Aaron. I was involved in your accident this morning and I was wondering how you're doing.
Well, I'm OK, but I can't work for a week.
: Oh, sorry to hear that.
....
:....
:Uh, well I hope you get better soon.
Ok, bye.
He didn't ask how I was, how my passenger was, how my car was, didn't thank me for using my car as a giant wheel chock, nothing. I'm a little bitter. If someone's car kept mine from rolling into rush-hour traffic I'd never stop saying thanks.