Institutions

ESA - ESTEC
UCLA, ESS, Department of Earth and Space Sciences
IPlEx, Institute for Planets and Exoplanets
LESIA, Observatoire de Paris-Meudon
IAPS (IFSI and IASF merged in a new INAF institute)
ESO

Useful

Horizons
Small Body Database Browser
What's observable ?
Exposure Time Calculator, for ESO intruments
mag2flux
IDL Programming Tips
Objects visibility
Airmass - plot
Aladin, sky atlas & finding charts
Simbad, astronomical database
VizieR, catalogue serivce
Astro-ph
ADS Abstract Service
USGS Reflectance Spectroscopy
JPL Molecular Spectroscopy
NASA Ames IR spectral database
Optical data for dust analogs
Sciencesconf.org, a tool to make your conference webpage
Site du zero, HTML and CSS tutorials (French)

Random, but still useful

Videos made at EPSC 2012 by Maarten Roos
Rumor Mill
AAS Job Register
Weer, weather at ESTEC, to avoid biking under pouring rain...
Sleeping in Airports, check before traveling
USGS, California-Nevada Fault
Comparative planetology
Zooniverse, an alternative to Angry Birds