SWEEEEEET. I may have to get that. I'm a huge fan of the comics, and I'm hoping the movie does it justice; Brian Lee O'Malley is involved in production as far as I can tell, so I'll keep my fingers crossed...
You could always just google it. But here's the basic gist: lively boy meets dream girl, dream girl says she'll date him only if he defeats all her previous ex boyfriends, boy goes on mission defeating evil ex boyfriends. All while being in a world with the type of tone and mood from the types of movies Michael Cera is known for.