Here’s an article on 5 potential “iPad killers”. One of them is the Microsoft Courier which I’ve added a video for below.
I don’t know if I like the dual screen thing or not, but it’s more like a book and can be folded. Here’s the concept video for the Google Tablet.
The Archos is more expensive but has more features and is also coming with a TV tuner, so it can be used as a TV as well. Plus it has a back stand.
UPDATE: HP’s Slate