The iPhone 3.0 update has lots of goodies for end-users. But the update's real treasure trove may be the thousand or so programming tools Apple has added for app makers. With these programming enhancements, developers can add new features and built-in capabilities to their apps, further swelling the ranks of useful App Store offerings. Just a few days after iPhone 3.0's official release, we're already starting to see the arrival of apps that take advantage of these newfound tools. Here's a sampling of some of the iPhone 3.0-enhanced apps that have caught our eye.