Nmap 5.20 Released

"Happy new year, everyone. I'm happy to announce Nmap 5.20--our first
stable Nmap release since 5.00 last July! It offers more than 150
significant improvements, including:
o 30+ new Nmap Scripting Engine scripts
o enhanced performance and reduced memory consumption
o protocol-specific payloads for more effectie UDP scanning
o a completely rewritten traceroute engine
o massive OS and version detection DB updates (10,000+ signatures)"

http://nmap.org/download.html
http://nmap.org/changelog.html