After the last post I made, Geocaching.com have announced that they have submitted a Geocaching app to the Apple Appstore. It’s currently awaiting approval, but should be available soon. It will cost $9.99 (probably £5.99 in the UK). It basically does something very similar to iGeocaching, but allows you to do it online, so is a good online companion to iGeocaching. It would be handy for doing a quick few caches if you were somewhere without your GPSr. It also allows you to look up Trackable items.
For full details, see the geocaching.com forum entry here.
Review to come when the App is available…

looks like geocaching is going to be the next big thing!