The iPhone App is Fantastic, for looking up cache's logging field notes, etc. it was super convienient.
I used it to look up the cache's and then would input the coordinates into my Garmin(the iPhone 3G's GPS
wasn't all that accurate. don't know about the 3GS) and Even then is was the best app for geocaching.
GeoBeagle is much more accurate(at least with the GPS on my Moto DROID) but getting cache's on the fly
is cumbersome to be kind.
What we get in a geocaching.com app first and foremost is a wonderful way to look up all the cache's near
our current location, download them to our phones, view them all in a map, etc. without using a web browser
on a phone which even in the best circumstances is a zoom in and out excercise. I would hold the iPhone in one hand with the cache info, hints, logs, notes, etc. viewable my Garmin in the other locating the cache, then a quick field note instantly logged from the phone. Search up the next cache and enter it into the phone.
The iPhone totally eliminated my connecting my GPS to the computer or printing out any info from the website, etc. except for puzzle cache's. It has been the single biggest thing I've missed switching to The Motorolla DROID from iPhone.
I think it is a great move by geocaching.com...Verizon has the biggest subscriber base, and now finally have some decent phones available. You can get Moto DROID's for $110 and HTC Eris' for FREE with 2 yera contracts, so these should only increase in popularity drastically, as well as the Nexus 1, G1, etc.
With the Motorolla DROID's GPS, I may start keeping the Garmin in my pack as a back-up once this app comes out....
Can't wait will totally be worth the Money if it's at $9.99 like the iPhone APP, I'de pay $19.95 or $24.95 for it
without delay if it was available.