It's been a while since I read my copy, but I actually have to side with Rob. It's pretty detailed and addresses shit that I hadn't ever thought about before, as well as reiterates the kind of stuff I found myself telling people on the smackjeeves forums every day; don't put the cart before the horse--don't be thinking about t-shirt designs and putting up a store before you even have ten pages up, consistently update to the best quality that you are capable of, don't spend a million bucks on advertising before you have enough content to actually keep people there, don't assume that there's some magical formula that will make you successful, and so on. Stuff I think everyone should know, or even have shoved down their throats as soon as possible upon entering this scene.
It covers a lot of the business aspects that aren't actually about making webcomics, so if I want to know how to prep my book for print in indesign or quark, or prepare for a convention, or set up a con toolkit, or order a banner, or code an ad-chain--all things I may have to eventually consider, then it's all there in one place and I don't have to google for hours to recall it.
The other books you've mentioned are invaluable, yes, but don't discount this one before checking it out. It's pretty handy, overall.
PS~ Welcome to the forum, wordgunofanun =P