Dave Elkins

http://timetobleed.com/garbage-collection-slides-from-la-ruby-conference/
It goes into a lot of details about how ruby allocates memory and how the GC works.  Also, talks about tracking down memory leaks.

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http://www.subelsky.com/2010/02/using-rubys-queue-class-to-manage-inter.html
A good post by Mike Subelsky about Ruby Queues.

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Good post about a possible issue with Passenger, Interlock, Cache Fu and Memcached
http://plasti.cx/2010/02/03/getting-passenger-to-play-nice-with-interlock-cache_fu-and-memcached

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SafeBuffers by Katz – http://yehudakatz.com/2010/02/01/safebuffers-and-rails-3-0
New Validation Methods by lindsaar.net – http://lindsaar.net/2010/1/31/validates_rails_3_awesome_is_true
rails-upgrade plugin by omgboglol – http://omgbloglol.com/post/364624593/rails-upgrade-is-now-an-official-plugin

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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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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://37signals.com/svn/posts/1872-nuts-bolts-configuration-management-with-chef
http://github.com/37signals/37s_cookbooks/tree/master

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http://blog.new-bamboo.co.uk/2009/8/14/block-helpers

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