Hazel 2.3.5 is finally out of beta. It features a couple new, nifty features including sequential file numbering (use the "#" attribute in your renaming patterns) and mirroring folder structures (use the "source folder" attribute sorting patterns). There are also a bunch of tweaks, improvements and fixes.
Release notes here: http://www.noodlesoft.com/releases.php
Use the auto-updater or grab it from the main Hazel page: http://www.noodlesoft.com/hazel