Hi, I noticed that both font libraries include an IE7 version of the CSS file - and both of these CSS files are also included inside your plugin.
However, I can't see any reference to them in the HTML code of my webpages after I've enabled your plugin.
I can see the <link rel='stylesheet'> entry for the two main CSS files from your plugin, but not the IE7 versions.
Would you be able to add the IE7 versions too, using the suggested conditional entry like below?...
<!--[if IE 7]> <link rel="stylesheet" href="path/to/font-awesome/css/font-awesome-ie7.min.css"> <![endif]-->
(You could perhaps make this an optional feature via a plugin options page for your plugin, if some people don't want to have it).