access to non-free from aptitude (continued)?

[Charles Blair <c-blair@illinois.edu>]

   [Sorry, I'm using claws-mail and it doesn't seem to let
me post follow-ups]

      Thanks to everyone for the prompt responses, but I still have
a problem.  My /etc/apt/sources.list includes

> deb http://debian.uchicago.edu/debian/ lenny main contrib non-free

   I tried typing "aptitude update".  Part of the output:

> Ign http://debian.uchicago.edu lenny/non-free Translation-en_US
> Ign http://debian.uchicago.edu lenny/non-free Packages/DiffIndex
> Hit http://debian.uchicago.edu lenny/non-free Packages

   However, when I start aptitude, click on "not installed
packages," then on "editors," the only thing I see is main.

   Is there an aptitude tutorial someplace?  I suspect there
are a lot of basic things I don't know.