Non-16:9 Tablets?

I could go on for ages about why I don't like 16:9 on a tablet. But that's a waste of time, the only real problem is portrait mode which to me is essential on a tablet.

Does anyone have an idea of what screen size ratios would work for a tablet that's a workhorse, a reader and a mediaplayer? The pixel's 3:2 is the closest to workable I've seen, but it's still not perfect.

And maybe, more importantly, is there an OEM even thinking about stuff like this? The only screens I've seen for Windows 8 are 16:9..