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Sweet: Windows 8: Search Cornucopia
Search in Windows 8 is pretty darn spiffy. Basically, you can define all the apps you'd like Windows to use to perform a search that you specify from the charm bar. This way, the power of search is all consolidated to one handy location: whether you need to search for something on your computer, on Google, or elsewhere, it's all right there for you without having to click through various windows.
[See also: 10 Google search secrets]
Scary: Windows 8: App Fragmentation
Perhaps one of the most glaring inconsistencies I've seen in Windows 8 thus far is the discordance between Modern and desktop apps. The Skype app is a perfect example, in which you can have a "Windows 8 Modern UI" version installed, in addition to a desktop version. Both have completely different UIs and they run independently of one another. It's not really a big deal, until you get to things like installing Internet browsers. Because the installations are completely different, all the bookmarks and settings you have in, say, Chrome for Windows 8 will be completely separate from whatever you might do in the pre-existing version of Chrome that runs on pre-Windows 8 versions of Windows. Get ready to start picking and choosing!
Sweet: Windows 8: File Transfer
FINALLY! Microsoft finally coded the ability to pause file transfers in Windows 8. Not only that, but they also included a real-time data transfer rate that shows how fast your files are transferring. Right now, this is one of my absolute favorite features of Windows 8!