Transformation Tool Options: Layer and Guide, Selection, Path or Vector
There is a choice with the transformation tools, a choice between performing the transformation on layers and/or guides, selections or paths and/or vectors. Shown here in the simplest of circumstances in the flip tool options.
New Dialogs, Splash, Subject and a Desktop Flip
There are new dialogs and buttons all over the place in GIMP lately so I added a new section to my web site for them, there was a new splash screen when I started GIMP today (2006-11-26) and I am flipping where the two columns of GIMP are on my desktop because I have never done that before.