The Book of Triads has been released on Amazon over the weekend. This means if you have a Kindle you can cram it full of 80 different ways to play the triads in the C Major scale and carry it around with you, or put your Kindle on your music stand and practice anytime you want.
Check it out here if you are in the US- http://www.amazon.com/dp/B005VTAU3C
Or here if you are in the UK: In the UK:
It gets delivered just like any other Kindle title right to your device by some form of magic and little scurrying elves or something.
Take a look and write a review if you are a new happy owner of these 80+ pages of triadic information.