This site is about a GIMP plugin called Liquid Rescale.
The Seam Carving procedure aims at resizing pictures non uniformly while preserving their features, i.e. avoiding distortion of the important parts.
The plugin supports manual feature selection, and can also be used to remove portions of the picture in a consistent way.
Since version 0.6 it also supports real-time interactive scaling.
The latest version is 0.7.1, released on Jun 6th, 2010.
It requires GIMP 2.6 or newer.
After installation, you will find it under the Layer menu in GIMP.