SimilarSites, A new service to get similar sites for a website you want.
Also you can make a site suggestion.
Google anounced today on their blog that they introduce to developers an enterly tool, google developer were using on google websites to test its speed.
No one can deny that Stack Overflow become now the biggest programming Q&A website.Also you can consider Stack Overflow as a wiki, blog, forum and digg/reddit in the same place.
