How does one handle window placement in a single monitor setup like that? I quite often use Windows' fill right, fill left, maximize, fill height options for window arrangement.
When I got my Seiki I basically tried all of the different Mac Window managers, most of them were immediately out of the running as they couldn't support a large enough grid to make sense (2x2 was the standard).
With Divvy I could set up a 6x6 grid which is perfect as you can easily set global shortcuts to treat it as either a 3x3 grid or a 2x3 grid with your keyboard shortcuts on the Command and Numpad (see image)
http://imgur.com/3E474eP
This is awesome as you don't have to really 'remember' a bunch of shortcuts as the keyboard grids look just like what your screen grids are.
I second the recommendation of Moom; its grid layout can go beyond the 2x2 that most other tools support and its window snapshot restoration is great for laptops.
I use a 39" Seiki with my MacBook, and managing windows is a relatively minor but real annoyance. I just drag and resize manually, and usually end up with overlapping windows of different sizes all over the place. I still love the display and would never go back, but it feels like I'm not using it quite as effectively as I could.
I suspect this is a gap that will be filled pretty quickly once these monitors become more common.
Presumably using a tiling window manager would solve that problem entirely. The window management in Windows/OS X is positively archaic compared to what you can get in Linux these days.