After upgrading to Leopard, the author explores the capabilities of Fluid, focusing initially on developing a standalone GitHub application using the provided JavaScript API. The application can display an unread message count that updates with each page load and offers quick links by holding down the GitHub icon. Although current features are limited, there is potential for future expansions as Fluid and GitHub develop, with the author expressing interest in integrating Growl notifications. Additionally, a Thumbnail plugin for commit logs can be activated by setting specific rules within the preferences, enhancing user experience with a visual coverflow for commits.