An article from venture capitalist and former technology journalist M.G. Siegler about the credibility of most news sources about technology topics. The short version: 75% of what you read in today's press is only marginally accurate, 20% is outright wrong, and only 5% actually are usefully accurate. He also discusses why it is that these inaccuracies go uncorrected.
Peer review is one safeguard that we use to try and establish the credibility of publications. It's not fool-proof, however, and is not a blanket guarantee. Here are some articles that discuss the strengths and weaknesses of peer review that you should keep in mind when evaluating the articles, websites, and publications that you read.