Dan has genuine insight into building software and large scale scalable systems in particular. You'll always learn something interesting reading his blog.

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Inverting the Reliability Stack, In Support of Non-Stop Software, Chaotic Perspectives, Latency Exists, Cope!, A Real eBay Architect Analyzes Part 3, Avoiding Two Phase Commit, Redux

Theo Schlossnagle is the author of Scalable Internet Architecture and the funder of OmniTI , a global leader in Internet technology services that power the World Wide Web and email.

As you might imagine Theo frequently posts on interesting topics for the scalable website builder.

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Partitioning vs. Federation vs. Sharding,
PostgreSQL warm standby on ZFS crack, Scalability vs. Performance: it isn't a battle

Follow this blog and you'll learn a lot about MySQL and how to make it sing.

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Working with large data sets in MySQL, PHP Large result sets and summary tables, Implementing efficient counters with MySQL.

Author of Web Analytics An Hour of Day. Has a fresh and practical take on unlocking the power of web research and web analytics to create truly data driven organizations for gaining a strategic competitive advantage.

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Find You Web Analytics Soul Mate (How To Run An Effective Tool Pilot), AK’s Web Analytics Tool Evaluation “Tips From A Tough Life”, Web Analytics Data Sampling 411, Six Data Visualizations That Rock!, Why “looking beyond the click” to optimize the experience is so necessary.

Royans' scalability blog and his main blog are excellent sources of scalability information. Take a look.

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Sharding: Different from Partitioning and Federation ?, Adventures of scaling eins.de, Session, state and scalability

A blog covering what the data center of the future will look like.

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The Next Generation Data Center Blog, Funding Instrumentation

Some intrepid company blogs are posting their technical challenges and how they solve them. I wish more would open up and talk about what they are doing as it helps everyone move forward. Here are a few blogs documenting their encounters with the bleeding edge: