I bought the G1 mainly so that I could use a variety of lenses and generally I am quite happy. I am being driven slightly mad(der) by the inconvenient two button switch to zoom for focussing. With Oly ZD lenses manual focus is a delight to use because the G1 senses the focus ring movement but with anything else I find I am forever pulling up the menu or the ISO change accidentally when I feel for the left arrow/central button sequence.
I think it would be great if we could have a single button press for manual focus zoom. Personally I would happily see the Film mode (which is a nice feature but not a top level control as it's not something which you change from shot to shot) relegated to a menu item and that button used as a manual focus zoom command button. Failing that anything that gives a single, immediately accesible single press function would do.
I'd be interested in hearing other views and if there is any concensus perhaps we could lobby Panasonic for a firmware change.