NASA released a new version of their "Blue Marble" whole Earth image. Blue Marble is their name for the stitched, cloud-free imagery they've gleaned from MODIS. They've done this before, but the new version (called Blue Earth: Next Generation -- original, I know) has better resolution (0.5 km vs 1 km) and more temporal data (12 months instead of 4 3-month intervals). The file sizes are huge, but they look great. Take a look!