Interactive Album of Map Projections
I like Penn State’s Interactive Album of Map Projections: it’s a truly dynamic tool that redraws a world map (or portion thereof) based on the parameters you give it — including 10 different projections — rather than an interface to a library of static images. You can, for example, set the central meridian and the map’s extent, and for the conical and azimuthal projections there are still more parameters. I had fun trying out the Robinson centred on different parts of the world. Via Cartography.
See previous entry: Java World Maps Projection Page.