Knoppix is good if you want to give it a shot without installing anything. The problem, however, is that because it runs off of a CD, it is slow to load things and you cannot install anything else. Its still a great way to tool around though.
Ill second the RedHat or Mandrake for a starter distro. Either one is easy to install and will serve you very well.
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"Good people do not need laws to tell them to act responsibly, while bad people will find a way around the laws."
--Plato
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