Title: Programming in D: Tutorial and Reference
Author: Ali Cehreli
Available for free (legally) at: http://ddili.org/ders/d.en/Programming_in_D.pdf

This is a fantastic book for those of you interested in learning D or just programming in general. I remember when I was first presented to programming it just didn't click in my head. I had a very strong mathematical background, but it didn't spark like it does for some people. I had to learn the hard way (by spending an awful amount of time).

The author does a great job of keeping things simple, straightforward, and providing reasonable exercises along with the solutions.