Letting other people see your screen, or work together on a whiteboard.
Sure you can run a long HDMI cable but it makes it a bit messy and dangerous. Devices like the Surface Pro 3 have Miracast built into them (aka WiDi) which allows you to connect your device to an external screen. At the Paradyne office we use a Netgear Push2TV device which works fairly well. This supports up to 1080p and is very easy to set up and get going, and retails for around $67 RRP.
What this allows you to do is also use your tablet and corresponding screen as a portable whiteboard. Instead of having a whiteboard and markers – simply use the Surface Pro 3 and the supplied stylus (or equivalent tablet device). Sure it’s not Surface Hub, but it’s a lot cheaper!
I use this setup on video calls using Skype for Business where we share the whiteboard in the meeting, instead of having an expensive digital device or having to point the camera at it.
Combined with the audio & video hardware devices I wrote about previously – for very little money you’ve now turned virtually any room into a conference room.
(NOTE: I am aware that Microsoft has a Wireless Display Adapter however it wasn’t available when I first wanted to use Miracast with my Surface Pro 3 so I haven’t had the opportunity to test it and am still happy with the Netgear Push2TV.)