Geocoding is a method of deriving spatial coordinates for tabular data stored in an addressable form. A manual equivalent is using pushpins to highlight locations on a map. GIS applications utilize an algorithmic matching method to automate such an effect. Geocoding 101
A basic overview of what geocoding is with a step-by-step example using ArcView. Find out how to map out your addressed databases.

Batch Geocode
Free service put together by Phillip Holmstrand using Yahoo’s new REST geocoding service. It lets you batch geocode addresses not just one at a time. Up to 50,000 per day per IP address.