The ESPN360 Multi-Launcher was my first Greasemonkey script written for my use trying to maximize my football viewing experience while using ESPN360 which I’ve written about before. Basically this is a simple script that changes the target window the player will launch in which allows you to open multiple copies instead of just reloading the one you already have open.
You’ll need the Greasemonkey extension to be able to install and use this script. I should also mention this was only tested under Firefox 3.0.1, so you may need to hack it up to get it to work under your prefered browser.