zooko's work is always good -- but I wanted to also call to people's attention my own comprehensive listing of all SCMs available for Linux. (zooko does link to it, as does David Wheeler's excellent page on the subject.)
I'm also very fond of Bazaar-NG author Martin Pool's comments. People who, like me, find his comments perceptive and enlightening will find more of the same in each Bazaar-NG tarball, as that promising project develops.
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