I use tinydns for a company that serves over one billion web hits per day (not visitors, hits, and no I'm not exaggerating). The authoritative nameservers serve between 100 and 300 queries/sec on each of five nameservers, for between 50 and 90 million queries answered per day.
Hardware on those servers ? Resource usage ?
I'd use tinydns first, then probably nsd, then something else before BIND (maybe powerDNS). I know BIND better than most people, I did a technical review for the "DNS & BIND Coobook" at the request of Cricket Liu, and I still don't use it anywhere I'm not forced to.
I'll take a extensive look at tinydns ...
