There is no need to buy commercial emoji app to get emoticons on your iPhone. Now that iPhone has copy&paste one can compose the text in external app like this:

… and then one can paste it into the tweet or into iTunes review of an app or a movie.

What is nice in this particular app is, that apart from emoticons (emoji) one can also pick many other symbols, including currencies, mathematical and more.

One must only remember that if you put emojis into tweets then only iPhone users can see your tweets properly…

Get it here (price: FREE, released just yesterday):

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Apart from iPhone, you might be interested also in Windows Mobile phones!