KnittingFun has just about every free sock pattern on the 'net listed
Convert shoe sizes to inches with the online Brannock Device
Hand Knit Hose is more than just a pattern, it describes the anatomy of a sock
The Sock Knitting Web Ring
SockKnitter's Home Page
Holly Doyne's review of sock yarn
Tips and tricks for knitting socks from SockKnitters
Some gorgeous socks, plus a pretty heel stitch
The Bureau of Missing Socks is not sock pattern page (but amusing nonetheless.)

Slipper Socks
The Sock Calculator, v2.1
Sheepish Socks (a sock pattern)
Linda's Sock Formula #3
Jill's short-row toe Socks is a pattern for socks worked from the toe up
Gary's Socks, version 1.0, is a pattern for men's boot socks
Jen's Colorful Slip-Stitch socks is a new pattern of mine