MS Critical Update Information Needed

Does anyone know of a website, newsgroup or other source of information devoted to testing Microsoft Critical Updates and then publishing findings as to possible bugs in the critical update? We are using MS Software Update Service, and though, I would like to have the time to research and test each critical update that comes out, I just don't have the time. If anyone knows of any source of information that could tip me off as to which critical update may cause more harm than good, I would really appreciate the heads up. thanks.