Stemming off of my question, I think that there should be a "Today's Birthdays" tab alongside, Top Posters, Points, etc. to allow all birthdays to be displayed. Or an overly would work too. Either way, limit + secondary view.
To go along with this, the side bar block should be randomized versus alphabetical listed.
On any day of the year there are loads of members that have their birthday. Unfortunately the display is random and instead of showing active members its showing mostly 0 post members. So in its current state it does not seem very useful to me.