My GH1 arrived today, making it my second m4/3 camera in as many weeks. One problem with buying two Panasonic cameras within such short span of time is file numbering. Since the two cameras will use the identical file numbering system, I'll inevitably run into duplicate file names. I assign different folder for each month, but that probably won't be enough. How do people cope with this problem? My understanding is that you can't change the file naming system (P1000001.jpg, .....). Any brilliant solution to this?