Here is an interesting site, Retraction Watch, that documents papers that are pulled from published scientific journals. Papers or authors can be withdrawn from the literature for various reasons (fraud, misconduct, errors, etc.). Their tagline is “Tracking retractions as a window into the scientific process.” For example, they recently covered article retractions due to faked peer-reviews using Elsevier’s editorial system. Check it out.
There is a new service called CrossMark from CrossRef, the organization that provides Digital Object Identifiers (DOIs). The goal is to have a CrossMark logo on digital documents (Web or PDF) that links to information about corrections, changes, and withdrawals. Be sure to click on the logo when it appears.