I am using jf_obj_import.rb.
http://www.scriptspot.com/sketchup/script/obj-importer

Moi+Hexagon+sketchup+sketchy phisics is the made thing.
http://sketchup.google.co.jp/3dwarehouse/details?mid=dd01860892992d4910f3a6c75a24d61e&prevstart=96