Animoog is my current favourite synth on the iPad, it's beyond awesome and it sounds really cool. Moog recently released it as an iPhone app so as you can probably guess; I brought it. The iPhone version is currently on sale for 69p so it's pretty cheap for such a cool little synth.
With the iPhone version I can now have the power and awesomeness of Animoog with me at all times. The iPhone app is pretty much exactly the same as the one on the iPad with the layout slightly modified so that it fits nicely on the smaller screen.
Your probably getting sick of hearing me complain about this but this app isn't universal, I don't understand why some companies think that people should buy their apps twice. I know it brings in a little more money but many people aren't going to buy something twice anyway. I've only made an exception here because of the low price and the quality of the app, but I still feel slightly cheated here. Universal apps are the way forward, stop scamming your customers out of their money.