After what seems like forever a new stable version of FUDforum is finally out. The upgrade and the installation scripts can be found here:
http://fudforum.org/download.php
This release incorporates a number of significant changes, including the introduction of Ajax for tree views and category collapsing. Improved Help (FAQ renamed) that offers better explanation on the various features FUDforum offers to the forum users. A number of performance improvements across the board and many other improvements and features. This release also includes a security fix relating to the mime handling for image uploads, the fix is retroactive, so it'll address any bogus images uploaded before the upgrade.