Literature
- ADS Abstract Service - Literature search
- astro-ph - Preprint archive
Astronomical Data
- DSS - Digitized Sky Survey
- NED - NASA/IPAC Extragalactic Database
- EURO-VO - The European Virtual Observatory
- RRFID - The Radio Reference Frame Image Database
Employment opportunities
Little programs
- Coordinate transformation (e.g. B1950 to J2000)
- Calendar converter (e.g. Gregorian to MJD)
- JPL's HORIZONS Ephemeris Generator (for solar system objects)
- Frequency-Wavelength-Energy Converter
Molecular line frequencies
- Rest Frequencies for molecular transitions - The LOVAS catalogue from the National Institute of Standards and Technology
- CDMS - The Cologne Database for Molecular Spectroscopy
Other useful information
- Estimating Observing Times - written for the 30-m telescope, but imho also useful in a more general context.