KakoMessenger lets you send a singing telegram instead of a simple text email (click on the image to hear my message).
Now try it yourself: select the singer that you would like to sing your text for you (Humphrey or Gina) and then type the message in the box (make sure that you are careful with your spelling and punctuation). Once you are done, click on "PLAY" and check out the result. If you like the message, send it to someone by email.
Be creative and have fun!