I suggest Spell Number as well..
I unlocked the Emoji in my iPod Touch, and 2 iPhones (mine and my wife's) using the FrostyPlace app, as we had not yet updated to 2.2.1. I also walked my dad through doing it for his and my mom's iPhones.
I had several friends who had already done the update, so when I found SpellNumber, I had them use that.
Even it FrostyPlace is working, the SpellNumber application is the easiest way to do it right now (as the EmojiFun App was pulled).
SpellNumber was simply a matter of following the Easter Egg tip and then activating the keyboard. It took me a little while with the FrostyPlace app to get it right. Besides, if I ever get really Lazy, I can use SpellNumber to make sure I am writing my checks correctly!!
Just my 2 cents!
EDIT/UPDATE: I just checked on Spell Number in the App Store and it is currently $.99. The note says he is changing the price for a few hours and will change it back to free, but for now it is a 99 cent app.
Nabby