[Pharo-project] Opening a webbrowser (using NB on non-Windows)

In Pharo 2.0 one can now use NBWin32Shell shellBrowse: 'http://www.pharo-project.org' which will open an external webbrowser on the given URL. This is currently limited to Windows. Anyone able to implement/call appropriate NB functions for Mac and Linux? I would like to see a unified interface coming with 2.0 NBWebbrowser shellBrowse: url dispatching to the appropriate class depending on OS. Since these days a lot of work is done using webbrowsers I think a unified way to open a browser on a given URL is required for Pharo. I also need this for the upcoming Pharo online help to work on all major platforms. Thanks T.