Please propose presentation topics below.
Drupal Forums: How to implement non-standard functionality
Understanding and Using CTools
Drupal + Version Control: Setting up a development, stage, and live environment and a release process
Using the Features Module to Build Reusable Sites
Writing an external authentication module
Using Apache Solr
Creating a mobile version of your site
Setting up Aegir for a large Drupal installation
Using Drush to Update Modules and Other Cool Tricks
Drupal Debugging - How to use XDebug
Overview caching options (APC, boost, memcached, etc)
CiviCRM: When and Why to use it
Building a membership-based Community Site
Using Agile Processes to develop Drupal Sites
Is It Going to Crash: Load Testing Drupal Sites
Migrating Data Using Migrate and Table Wizard
Drupal and the Semantic Web
Contrib Theming: Issues and challenges in creating a theme for contribution rather than custom use
+1 for Drupal / Solr
Drupal / Shindig / OpenSocial