Microsoft Windows 8 has been officially demoed and it looks pretty great, with it’s Windows Phone 7 inspired tile interface.
There are other new features being discovered by people who have the leaked pre beta builds and one of them is pretty great:
Built in ISO mounting
Windows 8 Center have got a screen shot which shows this:
This would be a brilliant addition. All my main machines have got Magic Disc & Magic ISO on them simply so I can mount ISO’s as and when needed. However it’s really annoying when you get a new machine and/or you’re working on someone else’s machine…you go to mount an ISO..BOOM – no can do, so you’ve got to go and download/install them. This new addition will save quite a lot of time across the IT Industry I would imagine 
Built in PDF Reader
This will also be cool, again saving users from one extra download and extra bit of 3rd party software on their machine.
SkyDrive
On paper, SkyDrive is awesome. 25GB of storage that you can access pretty much wherever and use either for personal storage alone or also to share things such as datasheets, documents etc with friends, clients, partners and more.
In practice, it’s quite difficult to use…fiddly, hard to find, not quite as easy to get things into/out of as you thought.
Integrating it straight into Windows 8 will see a massive rise in the use of Microsoft’s online storage, and will make the tablet piece even more compelling as users will have a built in, free, easy to use way of sharing/syncing quite a lot of “stuff” available immediately.
Cloudy with a chance of Licensing 
SkyDrive build in? That will make for interesting times keeping up with where your corporate data is and who owns it, especially with a BYO device.
These are great features. Like others such as Tweaked Disk Cleanup.
To help users manage disk space, Microsoft appears to have revamped the Disk Cleanup utility for Windows 8. Unlike the relatively simplistic tool in Windows 7, the enhanced utility showing up in Windows 8 pre-release builds includes options that let you sort files by size and type. This should make it much easier to reclaim disk space quickly by targeting temporary files and quickly spotting the biggest space hogs on your hard drive.