The MacDrifter site posted a helpful tip: Messages works well as a shared clipboard between your Macs and iOS devices. Either device type can be used for sharing text or images, but files can only be shared from Macs to iOS devices.
It works well and it seems easier than any of the third-party solutions I've tried.
Here's the two steps:
Mac OS X Hints
http://hints.macworld.com/article.php?story=20120226205001628