There were so many good sessions at DrupalCamp Oxford that it was difficult to decide what to see. We've tried to summarise the things we brought back from the camp, and what we learned.
More often than I'd like I see issues where Drupal's cron fails or exceeds the time limit. Here is a handy Drush command which will run all cron hooks on your site and the time it takes to run.
I really wanted to create a proper Drupal distribution. Nothing fancy - a basic Drupal 6, a nice responsive design theme, and some "mobile related" modules (Services, Rules, etc.).