Bluefish is a powerful text editor aimed towards developers with features such as syntax highlighting, indentation, support for projects, auto-completion and more.
If you like the minimap which shows you an an overview of your files that comes with Sublime Text 2, you'll be glad to know that such a plugin was released for Gedit.
The plugin is called Text Map and displays a navigable thumbnail of the entire file in the side pane
A few days ago I was telling you about using syntax highlighting in Nano (Linux command line text editor). Unfortunately Nano doesn't come with syntax highlighting for some of the most used languages such as CSS, PHP and XML by default.