I got a month subscription to @arcange's SteemSQL and was playing around as I was thinking about using it for a new project.
It is a lot of fun as it is so much easier to see data and faster and more complete than SteemData.
Some things I was testing out:
Cumulative Upvotes / Flags by day
Daily Author Rewards by day
Daily Comments & Posts count by day
New Accounts created by day
Why you should vote me as witness

My recent popular posts
The truth and lies about 25% curation, why what you know is FAKE NEWS
WTF is a hardware wallet, and why should you have one?
GINABOT - The Secret to your Sanity on Steemit
How to calculate post rewards
Use SSH all the time? Time for a big boy SSH Client
How to change your recovery account
How curation rewards work and how to be a kick ass curator
Markdown 101 - How to make kick ass posts on Steemit
Work ON your business, not in your business! - How to succeed as a small business
You are not entitled to an audience, you need to earn it!
How to properly setup SSH Key Authentication - If you are logging into your server with root, you are doing it wrong!
Building a Portable Game Console