Long-time reader, first-time poster. I don't really have much expertise where macs are concerned, but i've been browsing here ever since I decided I wanted a powerbook G5
However, this stuff is more my line of work
Anyhoo, from the OED (as good a reference as any):
"none
pronoun 1 not any. 2 no one.
adverb (none the) with comparative by no amount: none the wiser.
USAGE Some traditionalists maintain that none can only take a singular verb (as in none of them is coming tonight rather than none of them are coming tonight). However, none is descended from Old English nan meaning not one, and has been used for around a thousand years with either a singular or a plural verb, depending on the context and the emphasis needed."
As for a singular example, how about "To get the PBG5 to market, Apple could have made it from asbestos, made it five inches thick and stuffed it with fans, or just enclosed a free bag of ice with every unit, none of which is an acceptable solution."
It can be 'none is' or 'none are', and anyone interested enough to post in a thread about it is probably going to choose the right one for the context.