Emoji are enabled in iOS5? How did I miss…

1. ‘Settings’ app
2. Scroll down to General > Keyboard > International Keyboards
3. Add new Keyboard…
4. Scroll down to Emoji in the list of available Keyboards

Next time you use the keyboard, say, when sending a text, you will see a globe icon to the left of the space bar. Click on it to switch to the Emoji keyboard and/or scroll through your enabled keyboard options.