It literally changed my life! Most handmade sweaters I've seen before were boxy shapeless ones, and most sweater patterns are for generic S/M/L sizes that of course would never fit me. But from this book I learned how to make a seamless, fitted sweater customized to my own exact measurements, using any kind of yarn. It's really just about the math... and with some basic knitting skills anyone could easily do it. And with a little experience, you can even just look at a sweater sold in stores and figure out how to construct it. I don't even use patterns anymore, I just buy the yarn that appeals to me and sort of design my own. There's also a wonderful online knitting community called Ravelry where tons of knitters post pictures of their work and review yarns/patterns, and that's been an invaluable resource.
I don't have that much time to knit anymore, but here's some pictures of the sweaters I've made in the past. The first one was made from a pattern, the rest are my own experimentations with design.
Pink V-Neck Pullover
Purple Tweed Cardigan
Cotton Lace Top
(the lighting was horrible when I took this pic, actual color is more like on the dress form)
Cream Tweed Cable Boatneck
It's actually kind of funny because I live in SoCal where the weather is probably too warm for sweaters for most of the year... so it's a good thing I'm always cold!