Codeutopia.net readers can now get 20% off tickets to Velocityconf Europe 2011, in Berlin on 8 and 9 November. Here’s what you can expect: Velocity, O’Reilly Media’s successful Web Performance and Operations conference is coming to Europe for the first time! On 8 and 9 November, an international crowd of site reliability experts will converge at the Maritim proArte hotel …