I ran Slackware before, but now Ubuntu is going to replace Slackware for any desktop/laptop use. My laptop has been converted from Windows, and my desktop may follow if CS:Source and HL2 run in Cedega.
I gave a short Ubuntu demonstration to my school's computer club and just in a half hour of showing them the distro I got most of them begging for a CD. One converted from Slackware, one looked as if he might convert from Slack, and several others are Windows users. The rest just seemed quite impressed. One of the Slack kids was about to cream himself.