The deployment sites represent the collection of component versions that make up the regular AstroGrid release cycles.
Each of the components can be individually released between each of the major Astrogrid release cycles you can find the latest versions here.
All of the astrogrid components are distributed via the AstroGrid maven site, so it is possible to find a complete record of all the released versions by browsing this site directly at http://www.astrogrid.org/maven2/org/astrogrid/