The same way Agenday View on HTC Sense’s Calendar tab show a centralized list of your appointments, Manila Birthday will display a list like view of all your Contacts, birthdates and ages.
You have two display options: first one will tell you how many days till your Contacts’ Birthdays and sort them accordingly and the second one is an alphabetical list of your Contacts showing their age and birthdays. Whichever you use, tapping a Contact will open up that certain Contact on your Device. What’s really neat about the application is that is fully uses Manila/Sense graphics, being built on Manila SDK.
(Source: XDA Developers)