How to know what you've installed?

I'm doing a presentation on wireless as a school project (so that it can be included in a book ;)) and came across the following problem: neither OpenOffice 2 nor Gimp can read SVG files so I had to convert them in something which they can display (preferably PNG since it can preserve the transparency and still use as many colors as necessary). Browsing through the Synaptic Package Manager I quickly found a package which seemed to do exactly that: librsvg2-bin (and it was a small download too, aroung 70KB), however after installing it I had no idea how to use it. If you find yourself in a similar situation, you can find out what executables the given package installed by going to /var/cache/apt/archives and looking for the package you just installed. Open it (it's just an archive) and in the CONTENTS directory you can see all the files that were installed.

A final tip: if you wish to remove the files from the cache (to free up disk space), do the following from the command line: sudo apt-get clean.