As someone that's been developing and maintaining add-ons for a number of different forum applications and communities (although mostly for Deebs at FreddysHouse) I just wanted to say how well designed XenForo comes off to the developer. The ease of extension and ability to integrate new functionality in to the base of XenForo without having it look like I've sellotaped a duck on the side of an elephant is truely excellent. Examples being easily adding my own magical preview tooltips, integrating directly into the search so I don't have to care how it works or what it's running on and a few others sprint to mind. Normally I'd have spent an age developing a duck, to then spend another age painting it grey so you can't see it on the elephant. So, cheers guys.