I have a Garmin Nuvi 200 and an iPhone 3G... guess which GPSr is my primary caching device? the iPhone. I think that Wherigo and the iPhone are made for each other. I'm looking forward to possible iPhone development for Wherigo. I know that they're working as fast as they can to open it up to as many platforms as possible, but I'm starting to feel impatient. I think the sales and use of the Geocaching app for iPhone is some pretty good evidence that there's a market for a Wherigo app as well.