I've used pretty much every piece of forum software out there, and I can undoubtedly say that FusionBB is the best. It's flexible, fast, and is very easy to customize. Unlike many other forum scripts, FusionBB isn't a resource hog. It's also got great features that many more popular and more expensive forum scripts don't have, like the various widgets and particle boxes that allow you to customize your board with the info you want to display. Keep up the good work!