GIMP 2.5.4 Ready for Download
Several UI annoyances have been fixed. Docks and toolboxes can now be easily recovered from an accidental close via the window menu. You can also lock your tabs to a dock to keep yourself from dragging them out by mistake, and presets can be saved in all GIMP's color tools.
A blank, placeholder window has been added (pictured), which allows files to be dragged-and-dropped for editing.
The help system has been improved, and now supports online browsing. If you don't have the entire set of docs installed, GIMP will simply open the requested page in your web browser.
Full release notes are available here.