Go here and join Dairy Queen's Blizzard Club for a buy-one-get-one-free coupon for a blizzard of your choice. Go here to find the Dairy Queen closest to you.
Go here and join TCBY's email club and get a coupon for a free waffle cone. Find the store closest to you here (look at the top right of the page).
And don't forget: on tax day (April 15) the folks at Maggie Moos are offering a free slice of ice cream pizza. Find out more details on my earlier blog post here.