There's quite a few methods out there for killing IE6, a Google search will prove this.That said I have come across one of the better methods at http://ie6update.com/. This is a small chunk of Javascript which looks like IE’s Information Bar that you see when an ActiveX plugin it required. Instead it offers a browser update, really meaning it takes them to the Microsoft's IE8 site.You can find a wordpress pluggin at http://wordpress.org/extend/plugins/wp-ie6update/