Sequential art:
These are sites that are devoted to the progression of the comics medium or to changing perceptions/approaches to comics.
You will also find links here to sites that will give you hints and tips on professional comic art and disscussion groups for aspiring creators
Action2action
This group has now disbanded, but has formed a discusion group.
Scott McCloud
Ninth art
Hints and tips pages:
Comic artists direct
Draw comics
Inking survey
Inkers group
Guide to colouring comics