I'll admit it — I'm confused now.
It was OK at first. Even when everyone else was confused by them, WinRT, Windows RT, Metro style apps, Metro style and Windows 8 all used to make sense, and I could tell you what each of them was:
But first Metro style apps started getting called Windows Runtime-based apps on MSDN. Then the new Metro OneNote got called first OneNote MX as a codename and then OneNote for Windows 8. Now the help page explaining when you can and can't get offline access with the new Outlook Web App refers to what I assume are Windows RT devices as Windows 8 tablets — even though there will be Windows RT devices that are lightweight clamshell notebooks with touchscreens and almost every Windows RT tablet will come with an optional keyboard.
I really do think Windows 8 is the best of both worlds. The power of a Core i5 and background compatibility if you need it, the light weight and long battery life of an ARM tablet with smartphone-style apps if you don't, and both giving you Office, Explorer and Internet Explorer on both versions.
I use Windows 8 with a keyboard all day and I'm just as likely to press the Windows button on the keyboard or mouse into the corner for the Charms as I am to swipe my touchscreen, so I really don't buy the whole "bad without a touchscreen" Luddite view. I don't use many Metro apps yet, apart from Wordament, but I'm impressed by OneNote for Windows 8 — whatever you call it.
I'm going to use Windows on a notebook and a tablet and a media PC in the lounge and on a wall screen. But there are obvious differences between the different modes and versions of Windows 8 that need to be explained clearly. This revolving door of terminology isn't helping.