Recently DNSSEC advocate Rick Lamb made available publicly a site he’s maintained for some time offering statistics about what top level domains (TLDs) are signed with DNSSEC. The interesting aspect is that his scripts list the TLDs in reverse chronological order and so right now you can easily see when the “new generic TLDs” (newgTLDs) are being added as they all must be signed with DNSSEC from their launch. Rick’s site is available at:
http://rick.eng.br/dnssecstat/
Scrolling back the site provides a useful history of when various TLDs were first signed.