This site has the detailed documentation for each of the components that make up the AstroGrid software suite and contains information useful to the developers of this software. If you are an astronomer who simply wants to program at the "user" level then it is probably best to start with scripting using the AstroRuntime rather than looking at the detailed documentation on this site.
This release is known as 2009.1 and the versions of the individual components that make up this release can be found in the dependency management page and important changes are summarised in the changes report
The menu items on the left link to the major components