I found this article
that lists (in slideshow format, unfortunately) some of the lesser known new features of win10.
Some nice things that I've noticed so far:
better multi-monitor support with dual taskbars
prettier pictures on the lock screen.
The new Notification center, although reminiscent of OSX, is pretty nice.
Vastly improved start menu, obviously (Over win 8. I'm not yet convinced it's better than win7)
Maybe Cortana? Haven't tried her yet. Seems like it'll be fun for 5 minutes just like siri.
Improved layout of the settings app.
Virtual Desktops, very handy
Less derpy system sounds
CTRL V in Command Prompt. Someone over at MS gets it.
Candy Crush, Flipboard, Twitter, various Xbox apps, this list goes on. Seriously MS?
OneDrive comes installed, running, and not easily removable.
The new "Quick Access" view. I will literally never use that. Fortunately, I can switch back to the standard "My Computer" view.
Too much white. My Eyes!