iTranslator (in Japanese) is the easiest translator around to use.
52 Languages and counting.
-Anything you can copy and paste
-Text-to-speech most languages (included in price)
-Copy & Paste Functionality.
-Send translation via SMS & Email right from the App.
-Bookmark translation for future retrieval online or offline.
-Landscape Mode support.
-iOS4 Multitasking support.
-Ability to disable auto correct.
Many more exciting features coming soon.