Recently, I've been dealing a lot (...again...) with radiosity, interpolation,catching and all those things. I discovered a few links very interesting about that. Some of them are very known by the LW community.
The most popular maybe this article at EXCEPT site. Not updated to recent versions of Lightwave 3D but the best guide you can find about the LW GI 'world'
Tips and tricks in RENDERGEEK site.
A bit old but interesting thoughts and tips about radiosity at Foundation3D forum
Short but useful video about settings and results
Commercial videotutorial about free flickering radiosity with Lightwave 3D