There have been a few songs that have kept me in the car after I parked to finish listening. The latest has been Patty Griffin's "Useless Desires." Absolutely great tune. The lyrics are perfect, and the guitar doesn't overpower. They work together to grab you. It's a sad song, though.
Another song that grabs me like that has been Susan Tedeschi's "Don't Think TWice, It's Alright." (Dylan tune) She has a great voice and a few of the notes wwent right to the spine, sending chills up and down my spine.