The HomeBased Business site is choc-a-block with tips on common business issues, links to business sites and loads of free-stuff. It has a chat section as well. You could spend an hour or two here!
My personal favourite. If you are into web site design, there are numerous links to invaluable sites for development software, free backgrounds, buttons, lines, animated .gifs and everything you will ever need to create your own site - short of custom designs which make your own site unique.

 

Anything and Everything you wanted to know about how to setup and run your own home-based business.
Lots of links to reference books, software, chat groups and the like.

The Ottawa-Carleton Entrepreneurship Centre was established to assist new business men and women with the setup of their enterprises. They offer courses in all the relevant topics, research material and their web site is quite informative.