Transiting exoplanets afford the opportunity to study their atmospheres without the need to 
spatially separate the light from the planet from that of the star.  By carefully examining 
the modulation of the combined light from the planet and star during key phases of the known 
orbit, astronomers have taken a first glimpse into the chemistry, structure, and dynamics of
the atmospheres of hot Jupiters.  Current rapid progress is driven by the Spitzer Space 
Telescope, which has yielded broadband photometry and, most recently, spectra of these 
puzzling worlds.  I will review the results obtained during the past year, and look ahead to 
how these very same techniques might permit a study of the atmospheres of terrestrial 
planets in the habitable zones of low-mass stars.