Google. Yeah, there's no two ways about it: you have to have Google's Swiss Army Knife app on your iPhone. Search the internet by voice, location, or now, with the recent addition of Google goggles, by picture and barcode. Free.
Google Voice. Make calls and send text messages from your Google Voice number, voicemails are automatically transcribed to text so you can read them like email, send and receive text messages through the Google Voice app for free, and set up different greetings for different callers.
Rage HD. The splattertastic shooter Rage HD from Id Software—you know, the Doom and Quake guys. The graphics are unbelievably good, the best of any iPhone game yet. It's a must-download if you love shooters—just look. It's nuts. All in all, it's surprisingly solid to play, combined with truly amazing-for-a-phone graphics. While it maintains the pick-up-and-playability iPhone games need to have, hopefully it's part of a coming onslaught of more serious iPhone games for serious gamers. Remarkably, it's only $2,
Solomon's Keep. This is a great game! Good graphics, great replayability, if you like upgrading your character and destroying monsters. Wonderful base spells and upgrades, along with secondary spells, and upgrades. Its nice that you can make more than one character and save whenever. Can get difficult, but not usually frustratingly so. All over great game!
Minigore. While Minigore is in fact the survival shooter in the purest sense, its clever design elevates the game high above a dumb shootout contest, testing both your arcade skill and concentration.
Brain training application using dual N back methods. Keeping the brain in shape.
Wonderful program that allows you to completely control your computer with your iphone wherever you are. The computer screen pops up on the iphone and you control the mouse with the touch screen. Fairly easy to use. It would however, require a program to be opened up in the background of an open computer.