Another place i have spent a lot of time at is the Digital Photography Review web site. And especially the Nikon D40 Forum there. Tons of great info. I can read this forum for hours
After i finally decided to take the plunge into the DSLR world and purchase the Nikon D40, I found myself visiting Ken Rockwell's D40 web site almost every day while i waited for my new toy to arrive. This is a great site for simple to understand photography stuff and a must for new Nikon d40 users.