Hollywood is a business. Much like the stock market, people can buy chunks of films, put in a bit of cash...these people are the producers.
Tarintino is pretty well off, so he can buy pretty large chunks of movies. They're investments. If he reads a screenplay, and it sounds good to him, he'll bite.
So when a movie, like this one or Hostel, is tagged "presented" or "produced" by Quentin Tarintino, it's mostly saying 'Mr. Tarintino had faith in this film, so check it out'. As Rod said, he's a big name. He will put the asses in the seats.
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