Pdftk Builder

http://www.angusj.com/pdftkb/

Google Earth

http://gemvg.com/
http://www.ascc.sinica.edu.tw/gis/googlemap/
http://gis.ascc.net/ISTIS/tools.html
http://tw.myblog.yahoo.com/aerofoto-taiwan/
http://bernhard.sterzbach.de/googlemapsoverlay.html