Only recently, though, so I won't pretend to be an expert. As I understand it, an "app" (short for "apple") is like a videogame for your computer, except usually instead of playing games they do something less interesting and more useful.
Who comes up with this stuff, right?
At any rate, the real point here is that "apps" make you rich if you invent them. So here goes nothing:
Colorboss: Take a picture of something with your telephone and Colorboss will tell you what color it is. The blanket is ... yellow! The dog is ... black! The dog is ... blue! You found a blue dog! What?!
Holder: What are you holding? Leave questions like that up to Holder! It will tell you what you're holding! You are holding a can! Holder automatically updates your MySpace to let your friends know what you're holding. And who knows? Maybe you'll make a new friend with someone who is holding the same thing as you!
RaceBeast: Take a picture of someone, and type their race into RaceBeast. Assign the most races, and you will be The RaceBeast! But keep at it—thousands of other app users will be gunning for the title!
Under.the.hat: Whisper your secrets into Under.the.hat. No worries—it will never tell!
Greasegun: Greasegun makes all the sounds of a real grease-gun, but without all the greasy mess!
Who's Your Grammy: Relationship troubles? When you and your partner are in the throws of passion, Who's Your Grammy shouts out "Who's your grammy" in your voice! Relationship troubles over!
Encyclopedio: Need a fact? Encyclopedio contains many facts! Maybe yours is one of them.
All in all, you should feel free to take one of these ideas and develop it. We'll split the profits 80-20, until you make the standard developer's fee of $100. At that point, I will receive full royalties.