Thanks for the replies,
OK, so cmd-alt-tab does work, only problem with that is it's finger-numbingly awkward :-) SO is shift-f8 for single left hand flicking
As for hacking the OS to free up cmd-tab, i use cmd-tab a lot to flick around programs, no way i want to loose it. It begs the question also, why haven't quark changed to suit the OS?? Why not just change their cmd-tab to alt-tab or, better still a single key command, OR, better still lets at least be able to reassign the f-keys.
I guess it really becomes apparent when using Xpress after any adobe app.