| I recommend Slackware or Gentoo (Gentoo will be a bit more difficult I guess), or LFS if you're at the point where you wish to take time to very thoroughly acquaint yourself with your OS. - actually, I frequently recommend Slackware to new users as well just so they're forced to get a bit more familiar with Linux...
SuSe, Mandrake, and Redhat are basically the beginner distros (though there is nothing wrong with them - they're all Linux, just aimed a bit more towards new users than other distros)
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