"Tenable is pleased to announce the release of Nessus version 4! This blog post highlights some of the enhancements and new features available in Nessus 4.0. One of the most notable features is the ability to create custom XSLT reports based on your scan results. Nessus now also supports a fully multi-threaded scanning engine, which is improves performance and decrease your scan times. Nessus ProfessionalFeed and HomeFeed customers can upgrade to the latest version by visiting the Nessus Web Site. Please review the updated Nessus 4.0 Installation Guide and NessusClient 4.0 User Guide for installation and upgrade instructions and a complete list of new functionality and features."

Read more: http://blog.tenablesecurity.com/2009/04/nessus-version-4-released.html