Today I was searching for "Code Project" in Google in order to open its homepage to have a look at some new articles. the surprise was that I didn't find the codeproject.com site in the result! I tried to open the page directly by typing the url www.codeproject.com I found that the page rank of Code Project is zero!
Why do you think it's banned by Google?
As I remember codeproject.com has two or more domains that point to the same contents which violates the Google Search policy.
Now Code Project admins should remove any duplicated contents in any websites, and wait 2 or 3 months to have their old page rank back.
This drop in Code Project's Page Rank affects caused a drop in the site visitor as shown in the Alexa graph.