Sketchup is pretty handy for Reprap design once you install:
- http://www.guitar-list.com/download-software/convert-sketchup-skp-files-dxf-or-stl
- http://sketchuptips.blogspot.com/2010/03/sketchup-stl-importer-redo.html
- http://www.cad-addict.com/2009/07/sketchup-plugins-delete-coplanar-edges.html
- http://code.google.com/p/sketchup-svg-outline-plugin/
- http://support.ponoko.com/entries/20337512-find-holes-in-you