Here's the URL for the online documentation in case anyone had trouble finding it on the website...
For those inquiring about samples with invoking the web services, there are samples up there, and we're working on creating a full project that contains functioning callouts (sorry, it will be VS.NET 2003 C# project as that's the most common tool currently. A C# Mono project, using MonoDevelop, may also become available when I finish it as it's not "official")
Sr. Software Engineer, Nielsen Corp.
The comments above are solely the opinions of myself and do not reflect the opinions or views of my employer.