EDIT: Waaa... it deleted my intial line of text. It read something along the lines of "Inspired by some posts over here I thought it'd be interesting to see others' Start Screens, how they organise them and what they have. I'll start:"
And zoomed out:
I find that I almost always launch apps simply by typing the name and hitting return (using the search, essentially) and I never scrolled along the screen to launch app that weren't immediately visible with my mouse, so there seemed little point having them there.
My first group is basic day to day apps. Mostly I hit Desktop, People of Calendar from the Start Screen, Outlook and file explorer I tend to launch from the desktop and IM/Skype I only open to clear the notifications, since I use Skype desktop most of the time.
Next up is misc internet apps, including my all time favourite Windows 8 app, the LastPass app. From a user perspective I find this fantastic - fast, reliable, easy to use, does what it's supposed to with the minimum of hassle.
Next up is Office, 'Nough said.
Then some generic system utilities - these I'd probably normally launch via search.
Finally the Windows Store tile - I'll periodically scroll across and check the live tile for any updates.
So, what've other people got?