I used StumbleUpon to find this add-in for Firefox and Safari. It seeds Google Map urls to the iPhone via an email.
You drag a link to Safari’s toolbar or install in Firefox. Then when you have a map you want to see on your iPhone in Google Maps, you right click on that item to send it to the iPhone via email.
It is cross platform compatible working on OSX and Windows machines that have Safari and/or Windows installed. And the good news is, it is completely free.
Get it at: http://iphonesender.com/
