I have an iPod (iPhone also) and recently while synching it, I discovered three Applications on the iTune store about quilting.
The names of the apps:
1. Easy Quilt - lots of information regarding tools, blocks, How to videos, and more.
2. Quilt Fab - You type in the dimensions of your quilt and it will tell you the amount of fabric you need for backing, batting, borders, and binding.
3.Quilt Ref - Measurements of various quilts, lots of info about triangles.
You have your own teacher available, especially the many videos that show you all kinds of tricks.
Two of those apps are free, one is $2.99 (I can't remember which one)
Fabulous! I need to buy fabric for my civil war quilt binding. I typed in the size and it told me that I need 3/4 yd using 2 1/2 strips.
If you have one of these, you should have no trouble downloading them.