This article shows how you can convert .rpm packages to .deb packages with a tool called alien so that you can easily install them on Debian and Ubuntu systems.
Right here at HowtoForge
For example, I recently wrote a tutorial about MySQL Backup And Recovery With mysql-zrm On Debian Sarge. In that tutorial I had to install mysql-zrm from the sources because the developers had released an .rpm and a source package, but no .deb package. The installation was a little bit painful because there were no installation instructions for the source package. Now, with alien I can just convert the .rpm file to a .deb file and simply install that one.