I have also purchased a couple of books for inspiration, and to prompt me in the right direction with my colour schemes and methods. I think I have jumped the gun a little and tried out a few fancy concepts without getting the basics down first, and I would like to expand upon the basic colour theory I can only vaguely remember from the 8th grade!
Returning to the iPad (which was acquired using Frequent Flyer Miles, no need to pay full retail for Apple in my opinion) I have also been trying out Paper by 53. This neat little sketching App is very basic, offering no zoom capabilities, layers, or importing of other images, but somehow won my heart over with ease of use (I have tried with my fat fingers and failed miserably, instead opting for a cheap stylus). It will hopefully be useful as a basis for mapping/illustrating future battle reports and general sketching of ideas, but in the mean time I used it to follow the 'Eavy Metal Non-Metallic Metal guide from the back of my new book.