Finally ordered up my iphone4, and am trying to get a handle on some of the useful apps out there for getting the most out of the trails, and getting to the trails.

So far it looks like the Navigon gps app is getting good reviews, with TomTom's app close behind. Anybody here have hands-on with these, esp on the new iphone, or could recommend other apps that are useful in the great outdoors?

Up till now I've used my Nuvi on the road, and then my Garmin Legend on the trail, since the Nuvi doesn't breadcrumb. It'd be nice to have an app or two to do this.

Then there's things like
http://www.apptism.com/apps/clinometer

and
http://itunes.apple.com/us/app/advanced-level-inclinometer/id288338285?mt=8

and
http://appcomments.com/appdetails/Vehicle_Clinometer___Tilt_meter


Any experience with any of these, or others?

Cheers
Phil