Need to have a place were a user can write a Gift Message that is printed on the order so the fulfillment house can add a gift card to the order.

What is the best way to handle this?

Thnaks for the reply... It that the only field that will print on the invoice? It is labeled As "Special Instructions" on the input and the invoice, can those be modified without chnaging the code? What if I the User requires "Special Instructions".  All the other custom fields in the checkout stops wite to custom fields but don't print on the invoice... Any other thoughts about how to address this?