listing installed packages

[Donald Raikes]

Hello,

I have had my ubuntu 8.10 system installed for about a week, and have
added a lot of packages for testing purposes.

Is there a command-line way to list all installed packages so I can see
what has been installed?

I am blind, and while I can use synaptek, it is pretty cumbersome, so I
would preffer to just use apt to generate a list to a text file which I
can browse using my editor.
Love,
Me
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