Epimetheus, Saturn, and Titan from Cassini
Epimetheus glides in front of Saturn's rings with Titan far in the background.
Phil Plait's Bad Astronomy has pointed out another beautiful Cassini raw image. Think Titan is out of focus? Nope, it's just a thick atmosphere of nitrogen with a touch of methane.
Browse the Cassini's mission raw image archive here.
I made an animation out of another set of Cassini images here.