I highly recommend "Explorator"
- Explorator is a Yahoo "group" consisting of one person, who each week posts a summary of archaeology-related links he has encountered. As a further service, the links are even subdivided into topics like "North America," "Europe and the UK", "Early humans," etc. And when news breaks, he includes links from several sources on the topic.
I visit the site every week. It's easily the best way to keep up with new developments and discoveries.
Here's the link: Explorator .