Just tried 1st time downloading offline maps to Android Google Maps (SGS3) and it really was quick. I wonder, if Google Maps marks those downloaded offline maps with device-ID or something, so if someone shares further those offline aps, (s)he will get caught? Or if I just want to use the same offline maps in N900 with some application.

edit:
Google Maps for Android (ICS) also allows to download route to offline use. But when testing it, I noticed if the size of the maps of an area exceeds 85 MB, it won't download but reports one must reduce the area.