http://drupal.org/project/issues/search/contemplate?status=Open&priori... currently shows 4 outstanding critical issues against D7.
Would it be possible to tag specific issues blocking a stable release as D7 stable release blocker, so that we could try and get some helping hands on them? This is one of the top 50 projects, and the general lack of porting there is making D7 look scarier than it actually is. Might also help attract some additional hands to the project! :)