Leopard has been the archive interface for Spitzer data since the
mission began. As previously advertised, **Leopard is being retired as
the archive interface** -- data downloads will be disabled on 4
November 2010, which is the Thursday of the Spitzer/Herschel
conference!  We are planning an official Leopard retirement party
for the afternoon coffee break that day. Please plan on attending!

PS: The primary place where you should be downloading Spitzer data is
now the Spitzer Heritage Archive (SHA), which is resident at the
Infrared Science Archive (IRSA) at the Infrared Processing and
Analysis Center (IPAC).

http://irsa.ipac.caltech.edu/applications/Spitzer/SHA/