I've tried Slackware and I like the Arch-feeling better. I also like the "pacman" package manager.

Frugalware is also nice. Used it for a while. It was an awesome alternative when Arch got really unstable for a while some time ago. I use Arch again, but for everyone out there who has some problem (or simply needs a more stable approach) use Frugalware. It's also nice for people coming from Slackware or BSD.

Most things are close to Arch Linux, so it's pretty straight forward to switch between them without having to get used to another distribution again.

In short I think it can be a better alternative for people who don't like to hack (so much) on their systems.

http://frugalware.org/

Slackware isn't rolling release, though, is it?