Everybody likes to receive recognition and praise on their birthday, whether they admit to it or not. It gives people a "warm fuzzy feeling" knowing that you remembered their birthday and categorically took the time to celebrate it in some fashion, no matter how small. This can be as uncomplicated as a "Happy Birthday" and a pat on the back, or as complex, organized surprise birthday party bash.
One method of recognizing people on their birthdays is by sending out uncomplicated birthday wishes & sayings through the mail (or email), normally through a greeting card. The internet allows you to offer unique virtual greeting cards that consist of animations, music, and sometimes even interactive games. This is a great, facile way to let someone know that you're reasoning about them on their birthday.
This can be particularly productive for a boss or someone you have a crush on. It will right on score points, especially if they have never disclosed their actual birth date to you. They will be surprised and delighted by your observational skills and caring attitude.
