There are already apps for Android. I have "add watermark" app that was for free and works well.
Yes and the free for a few days was nice bait, but it's pay now. I'm really considering going Android anyway, I need a better camera. Or do I need a better phone that has a camera? LOL
I got the 3GS free two days after I bought one used. So I sold the phone with jailbreak and unlocked and kept the cracked one. Cracked as in, someone dropped it and the back of the case was cracked. No problem, works fine, and a nice OtterBox for under $20 and it's just dandy.
Meanwhile, Android seems more user friendly. You can do things, like change a battery or run the software that I decide I'd like to have, and use the carrier that I want to use...

Right now, WiFi in my coat pocket is what I do, no phone service and it's pretty functional.