  In this contribution we would like to emphasize the usefulness of data mining
multiwavelength surveys like the Sloan Digital Sky Survey (SDSS) or the ROSAT
All Sky Survey (RASS) -- which have become available to the public recently --
in order to find interesting objects suitable for adaptive optics (AO) or
interferometric (VLTI) observations in the infrared. We will present a sample
of extragalactic X-ray sources having an optical counterpart (based on SDSS
data release 1) which are suitable for AO/VLTI observations using a natural
guide star in their vicinity.
