While Joomla 2.5 has a significant number of improvements and features over Joomla 1.5, our favorites are upgrade notification and one click upgrades.
In an increasingly complex world it is not only convenient but critical to stay on top of security updates. The automatic notification system clearly shows whether your CMS installation is up-to-date. Additionally, 3rd party extensions which have been setup for one-click updating will provide notifications. This system saves an immense amount of time and money compared to Joomla 1.5, prevents obsolescence, and keeps your site future ready.
Over the next two months there will be a number of opportunities to learn more about Joomla, including: