Greetings, My application updates items periodically (and sometimes by user request) so I wanted to show the user that something had changed should they be looking, or have manually requested an update. One example is that double-clicking can cause an item to update... Once I got the code working, I thought it might be something other folks would like to use. A little extraction, and here it is: http://gist.github.com/846047 (It also shows how to set up double-click detection, which is easy, but I hadn't figured out before, and took a little searching. :/ ) The code is based off an old blog post ( http://www.bdunagan.com/2009/04/26/core-animation-on-the-mac/ ) but _heavily_ translated into Ruby-ish stylings. It might also be used as a cool example of using Core Animation in your UI; I'm sure happy with how it came out! I have to imagine that the right way to use it for real will be to make it a module, and 'include' it into delegates as needed. Hope folks enjoy! -- Morgan Schweers p.s. Please don't hesitate to let me know if you have problems with it, or if I'm making some tyro mistakes!