A promotional trailer for Ruben Fleischer’s Zombieland has been discovered online. From what I can tell, thus is basically an earlier version of the cut of the trailer which premiered at San Diego Comic-Con last week. I must warn you, some of the footage is not yet finished (green screens and all), and the quality is as you might expect — rough, but the promo reel gives you a better look at what Zombieland is about. My favorite part is when Woody Harrelson’s character is shooting zombies while riding on a roller coaster. Watch the trailer after the jump.

Columbia Pictures’ horror comedy Zombieland focuses on two men who have found a way to survive a world overrun by zombies. Columbus (Jesse Eisenberg) is a big wuss – but when you’re afraid of being eaten by zombies, fear can keep you alive. Tallahassee (Woody Harrelson) is an AK-totin’, zombie-slayin’ badass whose single determination is to get the last Twinkie on earth. As they join forces with Wichita (Emma Stone) and Little Rock (Abigail Breslin), who have also found unique ways to survive the zombie mayhem, they will have to determine which is worse: relying on each other or succumbing to the zombies.

Zombieland invades theaters on October 9th 2009.