Everything you need to know about PowerDNSSEC
The very latest and greatest can be found on http://powerdnssec.org/downloads/
Documentation can be found on http://doc.powerdns.com/powerdnssec-auth.html
We have a 'live' Best Current Practices for large scale DNSSEC use page here.
PowerDNSSEC is an integral part of releases 3.0 and 3.1 of the PowerDNS Authoritative Server. Please refer to the official docs!