Crossfont handles archived or

In reply to Converting Mac fonts to PC:

Crossfont handles archived or binhexed fonts containing the resource fork. More explanation here: http://www.asy.com/helpcf.htm#copymac

There's also FontXChange for Mac, which is an Intel app so should run on Lion: http://www.fontgear.net/fontxchange.html

FontForge is certainly capable, though perhaps a bit less straightforward— you'll probably want to consult Google:
http://www.google.com/search?q=fontforge+convert+mac+pc