If you've watched any of the Panorama X videos you may have seen me using PopClip, a program that adds iOS style text popups for copy/paste. It's a cool little program that I've been using for 2-3 years and I really like. I just noticed that it is currently on sale in the Mac App Store for $1.99, the regular price is $9.99. So if you like it, this is a great deal.
Here is a movie that shows PopClip in action.