Someone sent me a link to these tools and expressions. Although the company sells software and extensions for ArcGIS, they also some free tools. Of particular interest is the EasyCalculate section (See Summary below). I did not realize the true power of the field calculator until I had tested some of the provided expressions. It is truly amazing what can be done just by running the field calculator. If you have not had a chance I would recommend taking a look at the calculations and see what is available.
From the website:
EasyCalculate is a set of expressions currently 110 for the ArcGIS field calculator. The expressions can be loaded in the Field Calculator and when executed calculate some spatial characteristics of the features, edit the shapes, add records to a target layer, draw graphics etc.
Posted by wilsongis 