Yesterday I had a chance to tinker around with a new project using Merb, DataMapper, RSpec, and Thin. Merb + Thin means your app serves up pages twice as fast, with half the memory. Merb + DataMapper means your app is threadsafe. RSpec + DataMapper means your tests are completely independent of the database - which means no db:test:prepare step, so the tests run lightning fast and without fragile database dependencies.

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