I presume you're talking about the possibility of hanking NetMD with a Mac, in which case, fellow G-pard, be advised that the only avenue is to use Sony software under Windows emulation. Lots of apps do emu and, these days, strapping young Lextek, most can be found in hacked form. That's all I'll mutter.
So far as anything Mac-native goes, we're out of luck. Remember, this is an invention of Sony(TM). Sony -- the company that gleefully deprives people of the right to make digital copies of their own pants (and I know you want to do that right now but, really, we're on national television). Sony, the indefatiguable gimps who tried to market copy-proof CDs before yielding to lynch-mob-hostile consumers. Sony, the addled renunciates who remove more capabilities from music equipment yearly than smaller companies add. And if that's not enough, they make Windows-compatible CPUs.
Our only hope as MD users is that Jobs will notice our existence and incorporate MD-capability into iTunes 4(c)(iii). But I doubt that will happen, given Jah's zeal to sell iPods like so many spit-shiny rectangular spliffs.
Given the state of tech, you have to ask yourself why we don't own miniature DAT-quality hard drive recorders with built-in preamps. Why are we expected to be satisfied with 240kbps, inferior sample rates and zero ability to transfer original recordings digitally? Answer that query and you'll realize why Sony spends so much time fetishizing industrial design.