Today's Mars Photo shows a slab of exposed bedrock at Mars Exploration Rover Opportunity's current location. Opportunity has pulled up to this heart-shaped bedrock and will likely be studying it for a few days. The rock has been named Chester Lake by the MER team for reasons currently unknown.
This image is a compilation of photos as taken by Opportunity's panoramic camera. It was compiled and colored by Stuart Atkinson from The Road to Endeavour blog. Please note that this is not the true color, but it has been "enhanced and sharpened" to bring out subtle details on the rocks surface and in its surroundings." See a similar 3D image of this heart-shaped bedrock from the same blog.
Clicking this image will take you to the original, much larger image.