I'm amused to see that they have introduced a power-off button on the Start Screen. What's wrong with just pressing the on/off button on the computer itself?
Quite a few computer cases don't have an "easy to access" power button like on my Antec P180 (i.e. you need to open the front door to get to the power and reset buttons).
I switch it on by hitting a key on the keyboard too.
Zen 8000 Pro
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To sleep on a laptop you just close the lid. On a desktop sleep is unnecessary with Windows 8.1. Alternatively, set a suitable timeout so that the computer sleeps automatically.
There is no real reason for getting it now - Microsoft pull the "unoffically offical" update (and various source that now host it may not have left the files alone...). Wait 'til April and then let the fun begin!