Regarding 906 certifications, if a company files its Form 10-Q and the certification is not evident from the filing - that does not necessarily mean that it was not submitted under the Sarbanes-Oxley Act. The company may have submitted it as correspondence - which would not be publicly available.
Of course, filing it as part of the 10-Q might not be a bad idea - otherwise, the media and investors may jump to the conclusion that the company was unable - or unaware - to make the submission.
Late Friday, the SEC posted its proposal relating to certifications for analysts at http://www.sec.gov/rules/proposed/33-8119.htm.