Ok, I have a new smart phone (the droid) and am using the geocaching app geobeagle. Ran it side by side with my Gramin 60Csx, and must say the reception was just about spot on. Both lead me to the same spot, Garmin +/- 4 feet, geobeagle +/-2 yards. The app is not the smothest (brings up geocaching.com's list of closest chaches that have not been found, then goes arrow with distance. Works great, except clicking on the cache link with my big fat fingers.
I have a fried who has an iPhone, and the app seems to be super cool, however he says the GPSr's accuracy on the iPhone is not that good.
So if any of you out there are using your phones for geocaching, what phones, apps and results do you have?