There is now a driver that works for old clie's on win7 64bit. Available at: http://www.aceeca.com/downloads/index.php/cPath/1
Tested with Palm Desktop 4.1 (came on my nx70V cd), works perfectly. Calendar, todo's, all fine.
Only thing I cant get to go is the msimport stuff for the internal clie memory. Can use an external card reader obviously, but cant get at the inside stuff, as win7 wants a PEG mass storage driver which doesnt exist for this version of windows. (seemingly.)
Still. Can use it natively now for 90% of the stuff.