The secret to hemming knits. It's the type of thread you use! Rae Gun Ramblings
Serger Stitches 101 Cheat Sheet // Serger Pepper
By far, the best description I've seen on different interfacings and how to use them when sewing purses and bags. Sew Sweetness: All About Bag Interfacing
Recessed zipper tutorial
tiny sewist…teaching kids how to sew…lessons and projects
tips on sewing with tulle
A little tutorial on sewing perfect corners. This is so easy but I have never thought to do it this way.
sewing 101: basics of sewing machine maintenance