Most people, myself included, learned of The Temper Trap from their song "Sweet Disposition" (video below) which was featured in (500) Days of Summer. The album, however, is solid from beginning to end and worth a listen. On a related note, (500) Days of Summer is a great film, and you might as well check that out too!
Learn more about The Temper Trap at their website! You can find Conditions just about anywhere music is sold!