Definitely a top-notch book. Mainly because it's not just opinions like all the shit ebooks out there that basically say the same thing with different words. You know them all already. Sherpa is numbers and facts, testing and tracking which for me is the only information that means anything to me. If you're not already familiar with it, read "Scientific Advertising" by Claude Hopkins. Read it today. It's public domain. It will very quickly put you in the right mindset for building your business. That book is your foundation, tracking software are your tools (split testing, multivariate, Taguchi), and Marketing Sherpa is your "Physicians Desk Reference" moving forward.
By the way, there's was a link over at Black Hat World for the 2005 Marketing Sherpa edition. Live as of yesterday.
BHW is cesspool of mods pushin $500 ebooks on newbs. No need to wade through all that shit. I normally wouldn't waste my time finding a ebook but this one seems to be pretty good so here is a link. This is the one concerning landing pages
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hxxp://www.mediafire.com/?encxewnrnxi