Mike Grabski - a really cool posing tool

So I had a bit of a heart attack when I found this.  This is only for mac users so PC people sorry but I'm sure there is something similar.  Basically what this is is a plugin for OSX that allows you to keep most windows on top and you can add transparency to the window.  Great tool for posing!  

Here is the link to the download site.   http://infinite-labs.net/afloat/ 

The page describes which programs cant use this plugin, for animation purposes I haven't found any drawbacks yet.