I recently just purchased Maple, so perhaps I just don't know how to do this yet, but I think the ability to plot data on world maps would be a great feature to include. I am an Earth Scientist and often I have to port my data to something like GMT to plot fault data or seismicity on geographic locations. I know that both IDL and Matlab have those capabilities, and I think it would a great feature to include in Maple. Other solutions of this sort have just created ports to the GMT commnads. R creates a port to the GMT system calls, and SciPy with Matplotlib w/ basemap allow one to plot data on world maps.
I know it seems somewhat specific, but I still think it would be a great option. If it is alrewady included, please let me know! I only got Maple last week.