Excellent. You may wish to mention that the default Rails.cache is a per-process cache and doesn't work between instances / goes away at process death. For Me

Excellent. You may wish to mention that the default Rails.cache is a per-process cache and doesn't work between instances / goes away at process death. For Memcache users, configure Rails.cache to use Rails' built in :memcache_store: http://api.rubyonrails.org/classes/ActiveSupport/Cache/MemCacheStore.html http://api.rubyonrails.org/classes/ActiveSupport/Cache/MemCa... For Redis fans, try :redis_store: https://github.com/jodosha/redis-store https://github.com/jodosha/redis-store This covers Rails 3 caching pretty well: http://broadcastingadam.com/2011/05/advanced_caching_in_rails http://broadcastingadam.com/2011/05/advanced_caching_in_rail... Note for Rails 2: If I recall correctly, in Rails 2 fragment caching/action caching still uses the filesystem even if you have a cache_store set.