My Linux experience/knowledge is limited, but I've read quite a bit on tons of distros and their differences.
Synaptic/APT seems to be the king of package management today, but I wonder about the future? Maybe someone can explain why, but the Debian based distros tend to be locked into systems where upgrading requires a new install, and then still can't be kept up to date. By the time Ubuntu 7.04 comes out with the 2.6.20 kernel, it will already be out of date, and Ubuntu systems won't be able to upgrade till 7.10. (If I understood correctly.)
So I'm just curious what else might become king in the future?
Pacman- Arch Linux's package manager is a bit more complex in a sense, they claim it simpler, but it allows quick rolling distributions of updates, even kernels without reinstallation, and lets their systems have the leading edge of new releases. The problem is that Arch Linux is intentionally opposed to making the distro as a whole simple for beginners. Maybe someone will eventually take the Arch Pacman base and add the GUI goodness of Ubuntu/Mint. Every review of Arch seems to claim it the best Linux ever - because no beginners ever review it or try it. Eventually I'll have to make a partition to try it. I'm not sure I'd even succeed in the installation alone.
Conary - Rpath's package management, also used by Foresight. Seems like it could eventually be better than APT, but per most reviews, not yet.
Klik - maybe the easiest way to run somethings, but not to the exclusion of some all-purpose package management. Supposedly installs and isolates all dependencies together in one place, easy to remove.
CNR - Should be in Ubuntu 7.04 and so maybe Mint 3.0. I guess we will see. Currently an addition, not a replacement for APT.
Installjammer- something else I read about that maybe useful in the future. I didn't read enough to understand it.