His book took me by surprise. I expected it to have the same style and sort of content as his blog (like every other blogger who writes a book) but it was completely different. It consists of half a dozen (unrelated) chapters that end with an exercise. I'm not sure if Tempo is any good (I suspect his solutions overfit the data) but it's short (130 pages or so) so there's no reason not to pick it up if you like the way Venkat thinks.
I'm taking the liberty of adjusting your estimate of wanting to buy the book upwards to 30%.
Venkatesh Rao (who is amazing because he literally constantly challenges our definitions of everything):
http://www.quora.com/Venkatesh-Rao/Quora-Portfolio-Year-1
http://www.quora.com/Venkatesh-Rao
http://www.ribbonfarm.com/be-slightly-evil/
http://www.ribbonfarm.com
Gregory Rader:
http://www.quora.com/Gregory-Rader
http://onthespiral.com/
Daniel Lemire:
http://www.quora.com/Daniel-Lemire and http://lemire.me/blog/ are also super-super-super interesting
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I tried doing google searches of site:lesswrong.com + their names (or websites), but ended up with little. I'd like to see what LessWrong thinks of Rao in particular. I have NEVER seen posts that were as amazingly insightful as his. It's worth it just to sacrifice a day just to see all his amazing posts. The others were also amazing and really make you think about everything.
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E.g. with Rao, you have
My favorites:
http://www.quora.com/What-are-the-benefits-to-obtaining-a-PhD-in-the-field-of-Education/answer/Venkatesh-Rao?srid=0WH
http://www.ribbonfarm.com/2010/05/19/intellectual-gluttony/
http://www.ribbonfarm.com/2011/04/07/extroverts-introverts-aspies-and-codies
http://www.quora.com/What-careers-or-industries-are-the-most-meritocratic/answer/Venkatesh-Rao?srid=0WH
http://www.ribbonfarm.com/2008/09/11/how-to-measure-information-work
http://www.quora.com/What-are-some-tips-for-advanced-writers/answer/Venkatesh-Rao
http://www.quora.com/Children/Why-do-some-humans-not-want-children/answer/Venkatesh-Rao
http://www.quora.com/What-is-the-best-way-to-motivate-oneself-to-finish-a-PhD/answer/Venkatesh-Rao
http://www.quora.com/History/What-is-the-most-important-human-decision-ever-made/answer/Venkatesh-Rao
http://www.quora.com/Is-the-following-follower-model-the-new-standard-of-social-connection/answer/Venkatesh-Rao
http://www.quora.com/What-discipline-specific-principles-help-reframe-activities-so-as-to-provide-useful-insights-and-or-improvement
Rader:
http://onthespiral.com/stop-wasting-time-and-effort-developing-fragile-capabilities
http://onthespiral.com/unifying-value-universe
http://onthespiral.com/principles-disruptive-learning-environments
Lemire:
http://lemire.me/blog/archives/2010/08/16/working-long-hours-is-stupid
http://www.daniel-lemire.com/blog/archives/2010/02/08/trading-latency-for-quality-in-research
http://www.daniel-lemire.com/blog/archives/2009/09/14/how-things-change-cheaters-are-innovators
http://www.daniel-lemire.com/blog/archives/2008/08/19/the-secret-to-intellectual-productivity/
http://www.daniel-lemire.com/blog/archives/2010/01/13/the-fundamental-properties-of-computing/
http://www.daniel-lemire.com/blog/archives/2007/12/05/formal-definitions-are-less-useful-than-you-think/
http://www.daniel-lemire.com/blog/archives/2007/11/19/directed-research-is-useless/
http://lemire.me/blog/archives/2006/08/09/big-schools-are-not-longer-giving-researchers-an-edge/
http://lemire.me/blog/archives/2011/06/23/probabilities-are-unnecessary-mathematical-artifacts
http://lemire.me/blog/archives/2011/06/14/the-language-interpreters-are-the-new-machines
http://www.daniel-lemire.com/blog/archives/2009/08/01/why-i-hardly-ever-blog-about-my-ongoing-research/
http://lemire.me/blog/archives/2011/06/08/is-wikipedia-anti-intellectual
http://www.daniel-lemire.com/blog/archives/2008/06/05/why-pure-theory-is-wasteful
http://lemire.me/blog/archives/2011/06/06/why-i-still-program