GPS sat nav handheld devices with built-in spot messenger functionality. Epic! Starts from $550. Ideal for the true outdoor adventurist. Twitter just went global.
Download maps for the Map application on the N810 tablet without using the in-built software. Very useful. :-)
Free gps navigation for java based devices or phones.
Yellow Pages provide the (currently, Jan 08) best available online mapping service for South Africa while Yahoo Maps, Google Maps, etc appear to have no street level data.