Gimp Paint Studio is a collection of brushes and accompanying tool presets. Tool presets are a simply saved tool options, highly useful feature of the GIMP.
Ben Simonds has created three new brushes for Blender 2.5. Of course, these brushes should be used wisely by Second Life builders. They can be useful to add detail to high poly models as to bake textures to be applied to low poly models used in Second Life.