Last I checked, OCaml had a replay debugger -- one which lets you step backwards. And I know the mozilla guys sometimes use chronicle-recorder to fully record

Last I checked, OCaml had a replay debugger -- one which lets you step backwards. And I know the mozilla guys sometimes use chronicle-recorder to fully record a running application for debugging. (It was referenced in a bug I filed.) http://code.google.com/p/chronicle-recorder/