I had to make some minimum bounding circles from a set of points in ArcGIS. After some searching i came across a very useful script by Dan Patterson. Actually it comes as a set of scripts in a toolbox. Ready to be imported into ArcGIS 9.3. The toolbox has scripts for generating convex hull, minimum [...]

ArcGIS online resources center provides some very interesting basemaps for free. If you only need some background maps to visualize your information on, then this is a good solution. The service includes both basemaps, reference maps and elevation maps. There is a high degree of US maps, but still lots of valuable and time saving [...]