I would find it much easier if the tabs show which files are in the Editor were stacked vertically rather than horizontally. Stacked horizontally means that you run out of room
For newer versions of Eclipse, there is a plugin Open Editors which adds a view listing all open editors.
With ctrl+shift+e you can open an extra window that show you the open tabs vertically.
EditorViewer is very good The project is dead, but it works fine with Eclipse 3.7. Just drop the .jar file in the dropins folder
http://sourceforge.net/projects/editorviewer/?source=dlp