  A virtual observatory will not only enhance many current scientific
investigations, but it will also enable entirely new scientific explorations
due to both the federation of vast amounts of multiwavelength data and the new
archival services which will, as a necessity, be developed. The detailing of
specific science use cases is important in order to properly facilitate the
development of the necessary infrastructure of a virtual observatory. The
understanding of high velocity clouds is presented as an example science use
case, demonstrating the future synergy between the data (either catalog or
images), and the desired analysis in the new paradigm of a virtual observatory.
