All,
I know we occassionally get the question here, "I don't have a mac, but want
to build iPhone apps." I was poking around the net and found these two
solutions. The first actually mentions that it works with PhoneGap. I
don't think this will get you beyond the "You need a Mac to
build/publish/test in the wild", but it should get you a little closer.
The second one was actually the 1st I found and am not sure how compatible
it is with PhoneGap, but should at the least be good enough to test layout.
http://www.genuitec.com/mobile/
http://labs.blackbaud.com/NetCommunity/article?artid=662