The cluster luminosity function (CLF) is one of the most important diagnostics in the study of old globular and young compact star cluster populations. We are currently using ASTROVIRTEL to obtain CLFs in several optical and/or near-infrared passbands, and colour distributions. This will provide us with a powerful analytical tool for the determination of the violent star and cluster formation history of galaxies: we will address questions related to the universality of the globular CLF, the time-scale of low-mass, low-luminosity star cluster depletion and its observability, and environmental effects affecting the shape of the CLFs and the efficiency of the depletion process. This has required the development of complex data mining tools, which are currently being incorporated in ASTROVIRTEL's "querator".

2-page poster paper, to appear in "Toward an International Virtual Observatory", June 2002, Garching bei Muenchen (Germany), eds. Gorski K.M., et al., ESO conference series; full poster available from http://www.ast.cam.ac.uk/~grijs/VOposter.pdf