r.e. moving from SVN to HG - I've had success with the various tools [1] in converting entire histories to mercurial [2] (it was about 400 change sets) and also have been maintaining an SVN/HG dual repository for a wordpress plugin.<p>1. <a href="http://mercurial.selenic.com/wiki/WorkingWithSubversion" rel="nofollow">http://mercurial.selenic.com/wiki/WorkingWithSubversion</a>
2. <a href="http://hg.errant.me.uk/eventscripts-xa/changesets" rel="nofollow">http://hg.errant.me.uk/eventscripts-xa/changesets</a>