Recently I have gotten involved in sharing my GPS tracks onto the OpenStreetMap project, a great initiative! The idea is to share your infrastructure waypoints and points of interest in order to create a detailed global map which belongs to everyone and which everybody can use without copyright restrictions or other limitations.
I started by adding some of the tracks of my Mozambique/South Africa holiday/business trip back in November 2005. These were the first tracks in Mozambique at all which is quite exciting!! This is a great thing to get involved with so please check it out if you are an enthusiastic GPS user.