There are a lot of Sessions and BOFs about Responsive Web Design happening during Drupalcon Denver 2012, here is some overview:
Sessions
Introduction into RWD Tuesday 10:45am-11:45am Beginner
http://denver2012.drupal.org/program/sessions/responsive-web-design-past...
More Intermediate Overview of RWD Tuesday 2:15pm-3:15pm Intermediate
http://denver2012.drupal.org/program/sessions/rethinking-responsive-buil...
Case Study of RWD Site Tuesday 5:00pm-6:00pm Intermediate
http://denver2012.drupal.org/program/sessions/big-websites-small-screens...
Design for RWD Wednesday 10:45am-11:45am Beginner
http://denver2012.drupal.org/program/sessions/ux-design-every-screen
RWD with Omgega Theme Thursday 10:45am-11:45am Intermediate
http://denver2012.drupal.org/program/sessions/creating-responsive-and-mo...
Projectmanagement with RWD Thursday 1:00pm-2:00pm Beginner
http://denver2012.drupal.org/program/sessions/responsive-project-process
BOFs
Workflow, Project Management, Estimating with RWD Tuesday 11:45am-1:00pm
http://denver2012.drupal.org/bof/responsive-design-workflow-project-mana...
RWD with Sass+Compass Thursday 1:00pm-2:00pm
http://denver2012.drupal.org/bof/responsive-theming-using-sasscompass
Creative Concept Design Discussion (What software do you use to manage all those device layouts?) Thursday 2:15pm-3:15pm
http://denver2012.drupal.org/bof/responsive-design-creative-concept-desi...
RWD Developers Experience Sharing Wednesday 3:45pm-4:45pm
http://denver2012.drupal.org/bof/responsive-web-design-experience-sharing