BrightKite is location based social networking. It will post your current location to twitter, and other cool stuff. Currently invitation only (unlimited invitations).
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.
Free gps navigation for java based devices or phones.
eGadget is an online store in Sout Africa selling electronics and other gadgetry.
Download maps for the Map application on the N810 tablet without using the in-built software. Very useful. :-)
WebAntics sell GPS and other electronic gadgetry in South Africa.