Pretty cool post from Google's Blog to quickly view 21 services in a series of short videos.
Some essential videos
https://www.youtube.com/watch?v=xfwlbt3QZrM
https://www.youtube.com/watch?v=IemOAESlWKw
https://www.youtube.com/watch?v=xjsNWh1TLKo
You can find the full set of videos in the original post on Google's Blog.