Jekyll 0.5.0 has been released with significant updates allowing users to customize options through a _config.yml file, which is largely supported by GitHub Pages. These updates include the ability to choose a markdown processor, such as RDiscount instead of Maruku, and to select different permalink styles, like 'pretty'. This release also addresses numerous bug fixes, enhancing the overall functionality and user experience. Additional information can be found on GitHub Pages and in the Jekyll Readme, authored by Tom Preston-Werner.