Cookie A (from Baudelaire and Pomatomus fame) is selling some knee sock patterns on her web site [http://www.cookiea.com/index.php
]. Also, I believe the current issue of IK (Interweave Knits) has a pattern for toe up knee length and or calf length rib socks (however, I don't like the expansion method Ann Budd (?) uses).
PS. Knitty also has a more intricate cable pattern pair of knee socks titled Clessidra.