2010 is shaping up to be a banner year in at least two areas: major steps toward the deployment of DNSSEC, and discoveries of operational snags affecting the deployment of DNSSEC.
An example of the former took place on March 25, when it was announced that the ARPA TLD had been signed. ARPA contains the sub-zones in-addr.arpa and ip6.arpa, which are used for reverse DNS: converting IP addresses to DNS names. It is an essential piece of the DNS infrastructure, and the signing of ARPA makes it possible for reverse lookups to be cryptographically authenticated via DNSSEC.
Unfortunately, an example of the latter took place a short time later.