Is there a table listing contributed modules that have been ported to Drupal 7? To date I have found no quick way to determine which Drupal 6 contributed modules have been ported to Drupal 7.

Do you know of one, such as an automatically updated table that provides this critical site-building and version-selection information?
There is the D6 Upgrade Status Module that will list what modules installed on your system have modules in the D7+ versions of Drupal.