The ability to copy and paste text is a staple of the modern OS. Even iOS can do it, but on the Mac, the default clipboard behavior can be a bit limiting at times.
CmdVees is a little US$0.99 Mac App Store utility that acts as an extension to the OS X clipboard, allowing sequential clippings instead of forcing one copy to overwrite the next. Say you want to copy three things from one app to another separately -- with the default Mac clipboard behavior, you'd have to swop between those two apps three separate times (once for each piece of text you want to copy over). CmdVees allows you to copy the three pieces of text sequentially, one after the other, and then paste