Version 0.4.11 is the latest generally-available stable release of Neubot, distributed for Ubuntu >= 10.04, MacOSX >= 10.6, Windows >= XP SP3 and FreeBSD, as well as in source format.
Here's what changed in less than 140 characters: win32 auto updates prototype, bug fix for a database bug that corrupted pre-0.4.6 results, new event scheduler, cleanups, docs and fixes. Install, upgrade instructions at http://www.neubot.org/download, read on for more details.