The author has been blogging since 2006, giving detailed and well-illustrated explanations of a wide range of knitting techniques. There is a detailed index of the site by topic, which comes in handy when you're looking for, say, cast-ons and bind-offs, info on ribbing, or maybe the low-down on stripes (particularly jogless stripes).
Personally, I had trouble weaving in ends until I read some her tricks. There's even a list of ten ways to work in ends, 8 of which or as-you-go. There's bound to be something new or useful here for everyone, from beginners to seasoned crafters. Do you have a favorite knitting blog you'd like to share?