Update: FTDI BitBang tested with Mac OS X. It now works out of my IDE.
But I don't understand how to use the VCP driver and the D2XX driver at the same time on Mac OS. So right now the user must decide if her wants to upload sketches (using the VCP driver) or if he wants to burn the bootloader (using the D2XX driver).
But it is possible to use the FTDI BitBang hack for the Diecimila out of the IDE under Mac OS and Windows now and I used it to flash LumiNet nodes with it.
