The 360|flex conference featured around 360 attendees and approximately 50 sessions covering various topics related to Flex development, mobile app creation, and best practices in software development. Key highlights included discussions on frameworks like Robotlegs and PushButton Engine, as well as improvements in Flex typography and new approaches to development such as Test-Driven Development. Additionally, presenters emphasized the importance of user experience and explored emerging technologies and practices that developers could leverage for future projects.