As Calum said, I use Debian. The difference between Debian and the rpm-based distros is more than package management, although apt/dpkg is a great system. There's a philosophical difference; Debian is a group of volunteers that have built the (arguably) most stable Linux distibution available. Their quality control is extremely stringent; the "stable" branch usually will not crash unless the system has a hardware failure. The more "cutting egde" branches ( testing, unstable) are somewhat more prone to crashes, but they still run very well on most systems. It is perfectly possible to install Debian "stable" and never have to re-install; that was the original intent of apt/dpkg. When a new "stable" branch was released, the operator only had to establish an internet connection, enter "apt-get dist-upgrade" (without uotes) and the system would be automatically upgraded to the latest release, with no problems like dependancies or software conflicts, all at no cost to the owner (did I mention that Debian is a FREE operating system?)
All in all, I've found Debian to be tehnologically, morally and financially a VERY satisfying experience.
