Comment Puppy, Ubuntu 2005-2009, Mint Cinnamon (Score 1) 867
It is surprising how many have tried Slackware. I will give that one a whirl when I buy more CD/DVDs. Kind of cut my Linux teeth on 'buntu until my frustration level peaked. I think it is good to experiment with different distros and operating systems as you never know when you are going to be stuck trying something out (e.g.: running recovery software or Alien for Debian CLIs).
Overall, Linux has been a great experience; just learning as much as I can.
Okay, now maybe you pros can come up with a script to aggregate all this info...