From SpiceLoop: Use iEmoji and get the smiley/emoji keyboard on your iPhone or iPod Touch. Emoji are emoticons which you can can type within Notes, SMS, Mail or any other application on your iPhone. Launch iEmoji on your iPhone (or iPod Touch). Make sure you have wifi/cell connection so that your device is connected to the internet. Within the iEmoji app, click on Help at the bottom of the screen. Once you can see the help information, click on Done button on the right top. Exit iEmoji. Go to "Settings > General > Keyboard > International Keyboards > Japanese and turn ON Emoji. Now the emoji keyboard is enabled. To use the emoji keyboard in SMS, Mail, Notes or any other application, when you are typing on the keyboard, tap on the world/globe key (to the left of the space bar) to bring up the emoji keyboard.
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