Today's free app is SwiftKey Keyboard, normally $1.99
I am very happy with Swype (official beta) in portrait and default keyboard in landscape so I'm not going to give this a try. However I have heard a lot of good things about this keyboard so if you are looking for a different keyboard and want to pick up a good one for free you should probably give this a try today while it's free!
"Is life so dear, or peace so sweet, as to be purchased at the price of chains and slavery? Forbid it, Almighty God! I know not what course others may take; but as for me, give me liberty or give me death!"
-Patrick Henry, March 23, 1775