I just got this deal in my email.  If you are looking for an excuse to print off some of those digital photos tucked away on your hard drive, then go here and use the coupon code ONEDAY.  Walgreens is offering this deal online only.  Here are the details:

Coupon code ONEDAY valid once per account on February 20, 2009. Online orders must include 20 or more 4×6 or 4×5.3 prints at time of checkout to qualify. Limit 20 free prints per customer. Code must be entered at time of checkout to apply discount. Does not apply toward collage prints, taxes or shipping charges. Orders must be placed by logged-in customer by February 20, 2009 at 11:59 p.m. Central Time to qualify. Timing will be determined by Walgreens server clock. Only one coupon code per order. Offer valid online only.