I'm liking these posts on monetization:

• Bill Gurley of Benchmark, David Beisel of NextView Ventures, and Seth Rothman of Greylock on key factors for success in building online marketplaces.
• Fred Wilson of Union Square Ventures on revenue models for online commerce sites.
• Rishi Shah of Digioh on optimizing freemium pricing for SaaS; David Skok of Matrix Partners on why churn matters so much with SaaS models.
• M. Wensing presents a taxonomy of different types of freemium offers.
• Entrepreneur/angel investor Brian Balfour on solving the chicken & egg problem with network effects businesses; Sangeet Choudary writes about platforms and network effects, e.g., the impact or reverse network effects on social media.
• Tristan Kromer shows how to use a business model canvas based on "Puppies-as-a-Service" as an example.

I also enjoyed these posts on Customer Discovery and Validation:

• Cindy Alvarez on applying customer development techniques with different types of customers and on when to NOT use surveys.
• Laura Klein on how to use personas, how to overcome reservations about shipping an early product version, and the importance of validating a problem, not a product.
• Brent Chudoba on using surveys to validate pricing, messaging, and other key decisions.

Great posts on selling:

• Bootstrapper Robert Graham offers advice on cold calling early customers via email.
• Steve Blank on the challenges of closing a complex B2B sale with multiple decision influencers; Mark Suster of GRP Partners on the same topic.
• David Skok provides a link to a Bridge Group report on metrics and compensation data for SaaS inside sales.
• Mark Suster on when to hire sales people in an early-stage startup and how to choose them.
• Mark Roberge of HubSpot on how to use analytics to build a scalable sales team.
• Brent Adamson et al. on how/why the best sales reps avoid "talkers" who superficially show enthusiasm but are unable/unwilling to mobilize organizational support for a purchase.

Great posts on marketing:

• Blake Masters' summary of Peter Thiel's Stanford CS183 lecture on distribution, marketing and sales.
• Rob Go of NextView Ventures succinctly summarizes marketing fundamentals and their relevance for startups.
• Renee Warren of Onboardly offers comprehensive coverage of marketing basics in KISSmetrics' "Ultimate Guide to Startup Marketing."
• Sean Work of KISSmetrics and Zach Bulygo describe best practices of high-converting websites.
• David Skok of Matrix Partners on adapting marketing and sales tactics to stages of thecustomer buying cycle.
• Entrepreneur/angel investor Brian Balfour offers tips for testing user acquisition methods.
• Eric Siu offers tips for structuring A/B tests; Lance Kidwell on the same topic with specific application to landing pages.
• Tyler King offers tips for monetizing a blog.
• John Koetsier shares pointers for marketing a mobile app.

Great posts on product:

• Laura Klein on dealing with customers' aversion to feature/interface changes.
• Cindy Alvarez on what you will/won't learn from usability testing.
• Martina Lauchengco of Silicon Valley Product Group on the role of product marketing.
• Marty Cagan of SVPG on time-boxed product discovery and on continuous product discovery as a natural extension of continuous software deployment.
• Cagan on the difference between old and new school product management, and on the difference between live-data prototypes and production software.
• Adam Nash of Greylock on the responsibilities of great product leaders.
• Eric Ries on the product manager's lament with waterfall software development.
• Jacques Murphy on the challenges of introducing product management to a startup.
• Ben Yoskovitz on the product manager's role.
• Andrew Chen on Square's concept of product leaders as "product editors."
• Jayson DeMers of AudienceBloom on outsourcing pitfalls.

Great posts on funding:

• Blake Masters' summary of Peter Thiel's Stanford CS183 lecture on the motives/methods of venture capitalists.
• Jeff Bussgang of Flybridge Capital on passive vs. active VC seed investors.
• Rob Go of NextView Ventures on trends impacting seed funds and why VCs have a 20% equity ownership target. 
• Rob's partner David Beisel on how to select investors in a seed VC syndicate and on the motives of different types of angel investors.
• Mark Suster of GRP Partners offers a primer on fundraising, discusses when investors in the same round should get different share prices, and reviews the pros/cons of convertible debt
• Suster on super pro rata rights; Beisel on the same topic.
• Attorney Scott Edward Walker offers a primer on convertible note terms.
• Dave Balter of BzzAgent offers advice for angel investors.
• Blake Masters' summary of Peter Thiel's Stanford CS183 lecture on how to pitch VCs.