Deckdown is working and now accepts either urls, or markdown typed straight into a text box. It's still in an early experimental state. Feel free to use it for your presentations if you wish, just know that sailing is not yet a smooth as it could be when it comes to images and long text.

I'm at a basic proof of concept with some messy source code, BUT IT WORKS! Freedom from slideware jail is on the oh-so-delicious horizon...