Wide-screen mail reader in OSX?

I've really been pining for a sideways mail reader in OSX. If you don't know what I'm talking about, check out the screen shot to the right, although in Outlook I believe it's called a "reader pane" or something.

At any rate, most email clients stick to a two/three pane interface, as you can see by checking out Apple's Mail or my personal fav, GyazMail. Long and short, these are fine for the most part. Especially if you have more vertical space than you do horizontal, but most of my machines have the opposite... they're wide screened. By going to something like the clickable shot above, it ends up being much more efficient.

Especially for technical lists, which might have bits of code, or longer messages in general. Basically I either end up scrolling way more than I need to, or having to open more messages than I need to.

I looked around awhile ago, but no luck. Then I saw my favorite RSS reader Netnewsire has added a widescreen mode to their newsreader, and it is so much more efficient it has me itching again.

So far, no luck. Only the lowly Thunderbird seems to offer it. And no, I'm not Thunderbird, the problem is that it is very windows oriented, and as such, all of its performance goals go windows first and other platforms second. I also just don't really enjoy using it.

This sort of thing should take all of 5 minutes to add to a cocoa program, but since there aren't very many of them (Apple's Mail & Gyazmail & GNUMail), I guess there just isn't any real push.

*Sigh*