I know this isn’t totally related but I have a Nokia N95 and I was looking for a way to connect wirelessly to my laptop and still use its GPS! Now I can drive around using Google Earth (as long as I have 3G internet or have cached where I’m going, oh and if the wife lets me). Download it from here: http://www.symarctic.com/beta/static.php?page=extgps_download

I can tell you it works well (although I’m not sure if the battery life will be so good..)