Some resources (books and sites) are discussed in this blogpost: Books I learn stitches from...
- Lazy Daisy Peacock Feather Stitch
- Two ways to make a Brick Stitch
- The Bullion Knot
- The Open Wave Stitch (on the &Stitches blog)
- Simple Shading in Embroidery
- Basket Weave Stitch Effects