If you are interested in doing some programming, download the Google Web APIs Developer's Kit (http://www.google.com/apis/downloadl). While not strictly necessary to any Google API programming that you might do, the kit contains much that is useful:
A cross-platform WSDL file (see below) A Java wrapper library abstracting away some of the SOAP plumbing A sample .NET application Documentation, including JavaDoc and SOAP XML samples Simply click the download link, unzip the file, and take a look at the README.txt file to get underway.