Dave Elkins

http://www.ultrasaurus.com/sarahblog/2010/01/rails-security-review-checklist/

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Permanent Link to Polymorphic association support added to searchlogic
http://www.binarylogic.com/2010/01/23/polymorphic-association-support-added-to-searchlogic/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+binarylogic+%28Binary+Logic%29
more page dynamics, less client logic
http://pivotallabs.com/users/jb/blog/articles/1134-more-page-dynamics-less-client-logic

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http://m.onkey.org/2010/1/22/active-record-query-interface
http://railstips.org/blog/archives/2010/01/22/multiple-domain-page-caching/

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http://spyced.blogspot.com/2010/01/linux-performance-basics.html

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http://blog.plataformatec.com.br/2009/12/subdomains-and-sessions-to-the-rescue/

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http://24ways.org/2009/rock-solid-html-emails

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http://github.com/blog/551-optimizing-asset-bundling-and-serving-with-rails

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http://www.engineyard.com/blog/2009/how-to-ensure-your-email-gets-delivered/

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This is another great article from the EngineYard blog.  It talks about the common reasons for memory leaks that come from ActiveRecord.  It also provides links to several good tools for finding requests that have memory leak issues.
http://www.engineyard.com/blog/2009/thats-not-a-memory-leak-its-bloat/
Other links in article:

http://github.com/brynary/rack-bug/tree/master
http://github.com/binarylogic/memorylogic/tree/master
http://github.com/noahd1/oink/tree/master

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http://www.taylorluk.com/articles/2009/08/12/hey-pac-man-sup-subdomains

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