One of our best has finally returned to semi-regular posting after a long absence. Halfbreed, who graciously provided his insights and advice on the game some time ago, disappeared for a while after about May this year, but then he resurfaced a few weeks ago. If you're looking for a good place to go to get some insights into how to build and maintain a soft harem, or if you just like reading some rather funny (and perhaps mildly disturbing) stories written by a guy who knows how to write, then head on over to his blog and check it out.
(Be warned, however, that his blog ranges from somewhat to very NSFW, so be prudent; Lord knows, guys like us give the bloated land whales that populate the HR departments of this world enough excuses to fire us.)
I understand that he also has an eBook out now. From what I can see, this book addresses the end of the market that bloggers and game masters like Roosh and Blackdragon touch upon but haven't necessarily penetrated too deeply. (Sorry, couldn't resist.) That would be the part of the game where you've gotten past the approach, the escalation, the inevitable awkward moment outside her apartment, and the annoying LMR/ASD- i.e. when you get to the actually enjoyable part of the game. If this is an area of your life where you feel like you could use some improvement, I'd recommend checking it out- but only after you've already built a solid foundation on the teachings of guys like Halfbreed, Roosh, and Blackdragon.