Nice plugin! Thank you.
I was struggling with adding text shadow blur to my Cufon text. I read that the shadow blur is not supported with the Cufon script. However I did find this and replaced the Cufon-yui.js with the code from this Cufon script update.
and it worked (FF, IE, Chrome, and Safari). Just thought I would pass it along to you so might see if you can implement this into your future versions of this plugin, unless there is a downside I'm not seeing.