the black art of halo mods is currently featured in the home page news on Bungie.net.
here is a quote from the news story:
"The Black Art of Halo Mods by Stephen Cawood is packed with info on both the basic and advanced techniques of Halo CE customization. Included in the book is a crap load of tutorials and information on everything you can think of. Weapons, vehicles, bipeds, levels; you name it, it's got it. The most important parts of the book are the extensive chapters on the undocumented features of the Halo Editing Kit."