I am often asked how I learned the skills needed for website design when my background is in print. The very basics of HTML using Tables and Flash I learned at my alma mater, Marietta College. Everything else I discovered and learned through the web, with a few books.
Helpful online sources of information on web design/coding:
Opera Web Standards Curriculum
More advanced information:
Books I have found useful:
In general, my best advice when learning to develop websites, just Google it, you will end up seeing some inspiring sites, finding some interesting mentors and finding a host of resources at your fingertips.