Twitch TV Embed Suite allows easy placement of a twitch tv stream and/or chat anywhere on your WordPress site.
I'm quite impressed with this: Customizability works well and it loads as quick as a YouTube Embed!
Just installed this today and its all I've been looking for. A Twitch player, Twitch chat & a sidebar widget to show whether I'm on/offline to my website visitors. It's simple. Clean interface. No confusing instructions, user friendly and self explanatory. Took less than 5 minutes to setup on my site. I have nothing negative to say about it and I will be donating. Thank You!