Comparisons of Version Control Systems which mention darcs
Comparison of revision control software, Wikipedia article
Comments on Software Configuration Management (SCM) systems by David Wheeler
" Darcs does have some innovative approaches, though, and perhaps darcs will leap past everyone else..."
CMCrossroads.com Comparison of Open-Source Version Management Systems (in .doc format)
Looking Past CVS: The Future is Distributed, by Mark Stosberg, published on Linux Weekly News on December 2nd, 2004
Whose Distributed VCS Is The Most Distributed?, by John Goerzen