LISAsoft provide commercial support for the building of the Live DVD, as well as many of the applications packaged on the disc. Details at: http://www.lisasoft.com/LISAsoft/support.html.
Most packaged applications have both community and commercial support offerings for them. Refer to the package website for details. In addition, there are a large number of consultancy firms world wide who provide support for OSGeo member projects. See http://www.osgeo.org/search_profile for one that meets your needs.