I think that places like the AppStore and Android Market are good places to extend an already viable product like The Weather Channel, Twitter, OKCupid, Evernot

I think that places like the AppStore and Android Market are good places to extend an already viable product like The Weather Channel, Twitter, OKCupid, Evernote and Facebook, to name a few off my head. At least for general applications. But due to the quantity of already available free applications, you'll need to aim for high quality applications that offer something unique. Game developers on the other hand need to understand that the platform has a market with a short attention span. Unless it's a port of an already successful game like Doom or Final Fantasy, you're probably going to have to be pushing out a new app every couple months to stay on top. It is too easy for a consumer to get bored, and with a couple hundred thousand other free games available, you'll quickly lose your users if your game is dull. Games are where high quality unique applications can shine. In the end, developing me-too rip-off applications will get you no where. It may be a couple thousand a year, but that's not enough to do it full time. There's a lot of hype for developers who wan't to make a lot of money real quick with mobile applications, but it is no different than the shareware/trialware application buzz from some years ago.