Databases and Archives
AAVSO - variable stars
astro-ph - new papers literature search
Aladin - image viewer
FIRST Survey -radio data from the VLA
GCVS - General Catalog of Variable Stars
HEASARC - high energy archives
IPAC/ IRSA - infrared archives
Mars MOC gallery
NIST Atomic Spectra Database
Oasis - a multiband archive
SDSS -Sloan Digital Sky Survey
SIMBAD - awesome, a personal favorite and good starting point
SSC -Spitzer infrared data
MAST - multiband archive
NED - extragalactic database
NVO - National Virtual Observatory
PDS Geosciences node - datasets on planetary and solid body surfaces
Vizie-r - mother of many astronomical catalogues