I see, from my referrer logs, that zsync has made it onto Wikipedia. The entry is fairly well written too.

And it is being added to FreeBSD, which would explain the FreeBSD query-pr.cgi referrers in the log.

Direct google searches remain the main referrer, though. I am a little surprised at the distribution of user agents, though — since when were MSN so voracious? Google still has the lead, but not by a long way.