Drupal 7 Estimated Release Date
I have been eagerly following @drupal7release on Twitter, which tweets a daily estimate of when there will be zero critical issues left in the Drupal issue queue. However, this is a linear estimate, and it's based on the assumption that issues will continue to be solved at the same rate. But as the easy issues get solved, the remaining ones are difficult and take longer, so a linear estimate isn't adequate. This is made evident by the fact that the release date keeps creeping forward (it's moved forward almost a full month in the two months the system has been in operation).
