Let me introduce my service. It shows bunch of coins that I think are worth watching.
How it works in brief:
Every 15 sec it calls each exchange's API and grab price feed into Redis, browser javascript connects to coin-on Web Socket server, get data from Redis every 15 sec.
You can watch [Bittrex STEEM/BTC], [Bittrex SteemDollar/BTC], [Bitfinex USD/BTC] at a glance here.
(They call it SBD, but I renamed it to SD)
I believe Steem Dollar pegging is the key for bright future of steem, especially when BTC, STEEM prices are roller-coasting. Let's see how it goes.