Hampton Catlin has Dictionary! for the iPad (iTunes Link) in the iTunes App Store for FREE for a limited time. Deal expires April 10, 2010.

Dictionary! is an easy to use, no fluff dictionary app for your iPad. Helps you find words when you need to without getting in your way.

The entire dictionary is installed on your iPad! You have 200k+ definitions right on your pad. If you have a connection you can look it up online for a more detailed definition. Built the way a dictionary should be!