How has curvedns been for you? I need DNSCurve for a research project of mine but I'm very frightened to see that curvedns is the only forwarding implementation and gdnsd is the only authoritative implementation. Speaking of implementations, what the heck do you use for a client/resolver!?
That's the chicken/egg problem. The only real clients I've seen right now are the python testing implementation, OpenDNS's servers, and the DNSCrypt implementation that OpenDNS released: http://www.opendns.com/technology/dnscrypt/
Looking at one of my CurveDNS logs for the last few days and doing some very basic math:
$ grep "query too small to be DNSCurve packet" *.s | wc -l
27539
$ grep "DNSCurve shared secret" *.s | wc -l
2282
2282/29821 = .07652
So about 7.6% of all DNS queries are being answered via DNSCurve. Doing reverse IP lookups on the querying servers, nearly all of these requests are coming from OpenDNS.
btw, gdnsd dropped DNSCurve support in recent builds, so it's only curvedns now.