It's amazing how many apps are released in 1 week for the iPhone. Since the App Store was launched, I've followed the RSS feed from PinchMedia that lists all the apps that get added, and there are easily 500 per week. Most are useless, or lousy, but out of 500 per week, there are plenty of gems.

Here's a great idea to take advantage of the iPhone's ability to display custom pictures when people call:

Visuals for iPhone. ($0.99)

Over the last few months, I've taken up geocaching as a hobby. I picked up a dedicated GPS for it, but I started out doing it on my phone, which worked pretty well. The advantage of a dedicated unit is durability. My Garmin Oregon is water proof, you don't necessarily want your iPhone out in the elements. But for finding park n grab caches and a lot of the easier caches, the iPhone works great. The official geocaching app for iPhone is on sale for $2.99, normally $9.99.

Geocaching for iPhone ($2.99)

The iPhone is quickly becoming a powerhouse portable gaming device. Developers are learning to craft original games that really utilize the accelerometer and multi-touch controls. Even though it's a bit expensive, Rolando is worth every penny. It's a blast to play. Highly polished. In fact, you can pretty much go ahead and download all of the games that the developer, ngmoco, has released to date.
Rolando for iPhone ($9.99)

Another fun little gem for the iPhone is Sneezies. It's inexpensive and good for passing some time in line. Anna loves playing around with this one. The point of the game is to pick just the right spot to drop in the pixie dust that will set off a chain reaction of sneezing creatures to hit your goal for each level. It's really well done.

Sneezies for iPhone ($0.99)