It's heartwarming, really encouraging to see that Drupal 7 is undergoing a usability review. Drupal's a massively functional CMS, but all the functionality in the world won't help you when the average (for which read: can't write HTML, let alone PHP) CMS user can't discover it.
EditInline was first discussed here. It's a Drupal module that provides your site with handy editing links, inline with each node title, which rather than taking you to a separate editing page use a lightbox overlay on the current page to provide an inline editing interface.
It's currently in alpha but available under GPL on the Torchbox public subversion repository.
My Drupal module for editing nodes inline EditInline is at version ɑ-0.4. Just to summarize, the module lets you edit either the current node (or any other node where the title comes from Views or node template rendering) in a lightbox overlay.