Late in the code sprint the last day of DrupalCON in Copenhagen, there was a lot of discussion going on about the upgrade path in Drupal 7. Questions of how to handle certain aspects of the process and prevent horrible flaming death when upgrading a site and its contrib modules. Upgrade processes, much like data migration, often become a sticky problem. Right now that stickiness has literally stuck the release of Drupal 7.
Regardless of the release status, folks are starting to adopt D7 for their projects. The Examiner recently launched on Drupal 7. Acquia's Drupal Gardens moved into public beta this summer, also on D7. These folks aren't alone, but not everyone has the expertise and backing to convince the decision makers to live on the bleeding edge.
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