GIMP 2.7.3 adds Single Window Mode
GIMP 2.7.3 has added one of the most requested features in the program’s history: a single window mode. Version 2.7 is part of the development branch, so unfortunately, the feature wont hit most distro repositories for a while.
As I said, because 2.7 is a development branch, most distributions won’t add it to their repositories, and this means that you’ll have to build it yourself. It’s a shame, in a way, because the new window mode might be viewed as a ease of use feature that less advanced users would appreciate. According to this page, it looks like version 2.8 should arrive in about November.