Last month I was looking at the physics engine Box2D and ran across a Delphi port of it you can find here. Overall it is pretty cool to have the ability to link it right in to your app. One major problem however is performance. The exact same app written in C takes hardly any processor cycles while the Delphi version takes quite a bit more. I don't have any scientific tests or any explanations of the cause, but I look forward to watching this open source project mature!