See "Instructables" for a good tutorial on using this plugin with Sketchup, Inkscape, and Ponoko.

Part 1:

http://www.instructables.com/id/SketchUp-Inkscape-and-Ponoko-Laser-Cutting/

Part 2:

http://www.instructables.com/id/Designing_for_Ponoko_Laser_Cutting_with_SketchUp_a/

Latest additions to the plugin:

Exporting SVG faces from SketchUp

Exporting text annotations

Changing line colours and width

Launching your SVG editor from SketchUp