  A new astronomical window into the southern skies has been opened with the
high-frequency upgrade to the Australia Telescope Compact Array (ATCA), which
allows radio-interferometric mapping of sources at wavelengths as short as 3mm.
In anticipation of the upgrade's completion, a two-day workshop was held at the
University of Melbourne in November 2001. The workshop covered a diverse range
of fields, tied together by a common theme of identifying key areas where ATCA
observations can have an impact. More than half of the talks were concerned
with molecular clouds and star formation, with the remainder covering topics
such as molecular gas in the Galactic Centre, Seyfert nuclei, and high-redshift
objects. Some early results from the 3mm and 12mm prototype systems were also
presented. In consultation with the speakers, we are presenting in this article
a summary of the talks. The original slides are available at
http://www.atnf.csiro.au/whats_on/workshops/mm_science2001/ .
