Just to give you some idea of how dated content can get, I went to check out our local colleges curriculum. As my parents own a printshop and I was freelancing digital marketing services, I was browsing through their graphic design, marketing and business administration majors / minors. I went as far as going to the book store and checking out the content in the required reading.
It was a joke. The marketing literature didn't even touch on any elements of inbound marketing and was practically limited to branding and institutionalized branding at that. McDonald's aint an SMB and their communication practices do not apply to an SMB.
The other curriculums were a lot better, but looking at the dates you got to wonder how much information in them was null and void.
Point I'm making (Other than college curriculums need to be updated in
realtime) is that books get dated real quick. Especially when the content is dealing with technology, communications and marketing. That book is going to be dated by the time it's actually published.
Be careful of content you read in dated material (check internet dates, too). The last thing you want to do is reinforce dated information as the "best practices" for everything.
A couple other resources you might want to look at:
Marketing Day Email Newsletter - Daily email newsletter from Marketing Land. Single best daily digest for marketing related stories. I dare anyone to find something better.
YNOT - Adult industry resources. Covers everything from legal issues to business announcements. Not camming per say, but covers a lot of camming-related news.
XBIZ - Another adult industry resource. I've noticed that YNOT covers more camming-related stories, but XBIZ is a great resource too.
Google Webmaster Hangouts - If you're an SEO geek, get all your information straight from the mouth of Google in several different languages. I'm one of them SEO geeks, so you best believe I monitor this shit like a fucking tweaker.
Josh's SEO Channel - Once again, on SEO. If you don't want to listen to hours of Google hangouts in order to catch all the slips, Josh does a great job of summarizing everything. He's also a former-blackhat, so he's not one of those douchebag whitehat SEO consultants.