Well this is your choice to gift something or not, and in my first post i admitted that the biggest present is not a thing it's a time and attention.
Bunch of red roses or other flowers for romantic souls, or some gadget like pink iPod mini for tech woman.
As far as I'm concerned every day to me is another day. I only like July 4th which is Independence day and New Years because all you do is get drunk and blow shit up with fireworks. Other then that holidays have no meaning. My birthday to me is I am one year closer to death that is all.
That day isn't really celebrated in Western Canada where I am, frankly the International Talk Like a Pirate Day gets more attention here. So to answer your question, nothing. However, it's been a while since I bought my wife flowers so thanks for reminding me
I think the important thing is not how much you spend on a gift but the time and thought that you put into it to show the women in your life how she's appreciated.