Ubuntu 6.10, code named Edgy Eft, has been released [2] on the 26th October 2006.
You can get it for download from ubuntu mirrors [3]. Download it and try it ;).

Here is an excerpt of the new features:

• Tomboy, an easy-to-use and efficient note-taking tool
• F-Spot, a photo management tool that enables tagging, photo editing and automatic uploading to on-line web management sites such as Flickr
• GNOME 2.16, which in addition to new features such as enhanced power management, makes the GNOME desktop more secure, faster and more stable
• Upstart, a replacement start-up manager offering a cleaner design, eye-catching effects and a substantially faster boot time
• The latest Firefox web browser, which offers inline spell check support in web forms, easy recovery of crashed sessions, built-in phishing detectors, enhanced search engine management with built in OpenSearch support, and better support for previewing and subscribing to web feeds
• Proactive security features, preventing many common security vulnerabilities even before they are discovered
• Evolution 2.8.0, which brings new features such as vertical message panes

You can get the whole release note from edgy eft release note [4] official page.