Various web tools
Ned Wrights cosmo calculator
NICMOS Unit conversion form
Julian Date calculator (subtract 2400000.5 for MJD)
WFCPC2 CTE calculator
IRTF database of telluric standards
and
Gemini equivalent (although wasn't working Feb 2010).
AAVSO standard stars
APASS
2MASS images
MW extinction
calculator
HEASARC archive
Tool for creating
finding charts
Astrometry tool
Minor planet stuff and
more