Online Catalogs and other resources:
Infrared:
APM Catalog
NASA/Infrared and Submillimeter Data (IRSA)
Spitzer Space Telescope Archive
Two-Micron All Sky Survey (2MASS)
SOFIA Science Center
WSA-WFCAM Science Archive - Infrared
Optical:
SuperCOSMOS Science Archive - Optical
Optical Extragalactic Jets
Sloan Digital Sky Survey