From Dusk Till Dawn is a collaboration between Robert Rodriguez and Quentin Tarantino, where Rodriguez directed it and Tarantino scripted it. It's a cross between a heist/road movie and a vampire flick. A little weird combination, but trust me, it's worth the time!
It spawned to sequels, none of which RR or QT wrote or directed. I think they prouced them though. I've seen the third, set in the 1800's, and it pretty much sucked ass. Stay away from it.
Check out the trailer here, at 5,37Mb.