CAS Data Access
SkyServer
Web browser is all you need
Meant to support several levels of users:
http://cas.sdss.org/astro/ | http://skyserver.sdss.org/
Visual tools to browse image and catalog data
Command-line application programming interfaces:
emacs, sqlcl …also see
http://cas.sdss.org/astro/en/help/docs/api.asp
Strict limits on execution time and output size
always test-drive your query (‘quick’ or ‘top 100’)!