Star Jesse Eisenberg essentially extends the talkative but awkward adolescent he played in Roger Dodger into socially-maladjusted adulthood and it's a character he plays quite charmingly. Woody Harrelson plays a gung-ho redneck out to kill as many zombies as possible and hopefully find a Twinkie. I'll keep mute about their other co-stars, who include Emma Stone and Abigal Breslin, for fear of spoiling certain plot elements.
Oh, and the zombies, for their part, are more 28 Days Later than Night of the Living Dead. In case that matters to you.
I've never heard of writers Rhett Reese and Paul Wernick, who originally tried to sell the film as the pilot to a television series, but I suspect we'll be hearing a lot more from them, as well as fledgling director Ruben Fleischer.
Also: Go, Phils!