Last week we posted two video clips from Mark Webb’s 500 Days of Summer, which premieres later tonight at the Sundance Film Festival (check back for our take). Fox Searchlight has now released an official teaser trailer, which you can watch after the jump.

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The movie’s tagline is “Boy meets girl. Boy falls in love. Girl doesn’t.” The official plot synopsis follows: “This post modern love story is never what we expect it to be — it’s thorny yet exhilarating, funny and sad, a twisted journey of highs and lows that doesn’t quite go where we think it will. When Tom (Joseph Gordon-Levitt), a hapless greeting card copywriter and hopeless romantic, is blindsided after his girlfriend Summer (Zooey Deschanel) dumps him, he shifts back and forth through various periods of their 500 days “together” to try to figure out where things went wrong. His reflections ultimately lead him to finally rediscover his true passions in life.”

A FirstShowing spy who saw an early test screening called the film the best movie he’s seen over the last year. That’s pretty high praise. 500 Days of Summer is one of my most anticipated films of this year’s Sundance film festival. Fox Searchlight is distributing the film, and it seems like any film that mini-major touches (most recently Slumdog Millionaire and The Wrestler) turns to gold.

500 Days of Summer is scheduled to hit theaters on July 24th 2009.