Quote: "Looks to me like someone has been playing with Hyper-V >_<
"
Nope, I dual-boot.
Quote: "Seppuka Arts, did you have any problems with older apps -- older that Windows 7 and even older than VISTA? Windows 7 was still compatible with everything and all of the older Windows APIs."
In terms of compatibility, most of the programs and games I use work fine. Apps: Dark Basic Pro, Silo, Carrara, 3D Coat, MS Office 2010, MilkShape 3D, Multimedia Fusion 2 (demo), Windows Live Writer, yEd Graph Editor, Celtx, MapScape, Visual Studio 2012 (it would be a massive fail if it didn't) and Dark GDK.NET. They all work. I've not tried any other apps.
In terms of older games: Age of Empires III, Summoner, Final Fantasy VIII, they work perfectly. Neverwinter Nights runs, but is really sluggish, but I've yet to determine if it's Windows 8's fault or a driver issue - when I get my gaming laptop back from being repaired I'll be able to test it on Vista, then upgrade it to 8 and test it again.
What haven't I been able to run? Gile[s] won't run at all, which I'll admit, I am disappointed by because it's an ace tool for baking lightmaps. MapScape wouldn't run natively and needed to be troubleshooted before it'd run. MS insisted that if it ran on 7 it'll run on 8. Unfortunately, it's not true for the case of 3DWS and Gile[s].
If you're unsure and are thinking of taking the punt, I would back everything up and make sure you can recover your previous OS. I made sure I created recovery disks of Windows 7 first and I've got all my data backed up. Unfortunately you can never guarantee that nothing will go wrong, hence I always approach tech with caution.
Aside from any compatibility issues on some programs (which, unfortunately, you expect on an upgrade), the OS surprised me and pleasantly so. I was worried I was being stupid in taking a punt because I had heard lots of bad things. For me, it has been amazingly stable and really smooth - not only has MS been flashy, but they've taken into account performance and made it speedy, unlike when they were trying to be flashy with Vista, where 7 had to come in and save its butt.

I think in that respect MS has learned from their mistake.