Daniel Eisenstein (SDSS-III Director) just reported that the SDSS-III collaboration has over 600 active scientists involved in accessing and analysing SDSS data (as counted by their wiki-page accounts). These scientists come from the 50 worldwide institutions now involved in SDSS-III, as well as approved external participants, collaborators and contractors. This proves that the SDSS-III is one of the largest collaborations in Astronomy.