Third Hand on the iPhone/iPad lets you keep an overview of your clipboard history of your Mac. With a single tap you can paste any clipboard item. Ideal when writing text or working on images: You will never again have to copy the same thing twice.
To run third hand you need to run the app that monitors your clipboard on Mac OS X, and the app that shows the clipboard history on iOS:
Don't worry, your data is safe: data is encrypted and sent only between your Mac and your iPhone/iPad. Deleting a clipboard item with sensitive data from the list is as simple as a simple swipe.