We've recently come across a couple of great Marvel/Spidey websites.
The first one is MarvelDatabase.Com. It's a huge online cross-referenced Database (a wiki) of Marvel Info. It already has thousands of entries, and you can sign up and help extend it.
The second is Spidey's very own Blog. Yeah, you have to ask why it took so long to happen! Anyhow, it's updated most days, and it's pretty well done. Go check it out.