The New York Times discusses a new National Geographic publication, Ocean: An Illustrated Atlas. It's geared to general readers, and has got lots of maps, including the one above - a map of chlorophyll amounts in the world's oceans. (It's interesting how much ocean life tends to concentrate near the poles and the mouths of major rivers.)
Plus it's got lots of NatGeo-grade photography of guys like these:
Sea squirts. Cute, no?