The Leonard Maltin iPhone/iPod Touch app I posted about is on sale at the iTunes store for $2.99, down from $4.99. It's based on his paperback movie guide. I reckon the price drop is because of how slow the search feature is. Also, you can't find things by keyword. You have to know the exact title or name, or at least the beginning letters. If you search for movie titles containing the word "Henry", you'll get Henry V, but not The Private Life of Henry VIII.
Even with these problems, I still love and recommend the app. Get it while it's on sale, and you'll get free updates when they fix these problems.