Even though Slackware still uses the old ncurses-based installer and traditional approach of a Linux distribution, more and more Slackware-based Linux distribution comes up. The latest news is that Puppy Linux 3.00 has been released. This version is based on Slackware 12.0. Another distribution is NimbleX, which comes up with a LiveCD edition. Don't forget about ZenWalk and SLAX. It has good community as well.
It's just a statement that Slackware is still being used and trusted by it's users. In LinuxQuestions forum, Slackware forum is one of the most active categories and many people come to that forum. It's considered the biggest community site of Slackware.