I'm not going to list every site on the subject, only some of the best! Most of these sites have extensive link sections as well, so just look at this as a place to start!
Check out the sites of some of the artists who inspired me (listed alphabetically - well, sort of):
Blogs (sort of a category of their own these days):
Links to other great wargames sites (most of these sites feature great painting too):
Here are links to companies that produce some of my favorite models:
And the Weekly Larry Leadhead Cartoon! Click on the cartoon for more strips: