Listing user installed packages in Debian....

[Chris Bayley]

In Gentoo I can easily see which packages I have deliberately installed 
from the command line using 'emerge foobar' by looking in the 'world' 
file - how do to I find the same information in Debian ?
To be clear I do not want see all the installed packages on my system 
nor all the dependencies that I have caused be installed, just those 
foobars for which I have explicitly issued an 'apt-get install foobar' 
over and above a base system....

Cheers,
Chris.