Happy Birthday! is a simple application for keeping track of birthdays. It reads the contents of your address book and displays birthdays that fall into configurable ranges. You can configure how long past birthdays stay on the list and how far into the future you want them listed.
The actual birthday list includes the picture (if available) and name of the contact as well as relevant information pertaining to the birthday. Clicking the birthday entry displays the contact's address book information, enabling you to call (iPhone only) or e-mail him/her.
Furthermore, Happy Birthday! enables you to create custom entries for people you don't necessarily want to create an address book entry for (friends' kids, for instance).