Home Page Replica is/was one of the earliest collections of material about Captain Beefheart and the Magic Band on the web. It's updated infrequently.
Recently:
Grant O'Neill sent along some links to articles he's written about Captain Beefheart:
The Amazing Vanishing Spotlight Kid
The Spotlight Kid Revisited
Live from Carolside
Brave New Twirl
John "Drumbo" French has a new book out: Beefheart: Through the Eyes of Magic. The website has excerpts, and it's available on Amazon and on Ebay, signed. Look at the first review on Amazon...
Less recently:
I stumbled into a collection of my old news postings; it's missing a recent chunk, but it's still fine to browse.