Diva Gis Country Data. Country boundaries from the diva gis project website. More info on format.
From diva gis they can be exported to a number of other grid formats including idrisi and arc or to shapefiles. A very good list. High resolution satellite images landsat for nearly all of the world can be downloaded here.
They are in utm projections so you will need to project your shapefiles to utm as well.
Country boundaries from the diva gis project website. Country boundaries from the diva gis project website. Gridfiles are used in diva gis. From diva gis they can be exported to a number of other grid formats including idrisi and arc or to shapefiles.