Download Google's help files directly

Gmail Help: http://mail.google.com/support/?fulldump=1
Google Calendar Help: http://www.google.com/support/calendar/?fulldump=1
Google Docs Help: http://docs.google.com/support/?fulldump=1
Google Spreadsheets: http://docs.google.com/support/spreadsheets/?fulldump=1
Google Presentations: http://docs.google.com/support/presentations/?fulldump=1
Google Reader Help: http://www.google.com/support/reader/?fulldump=1
Google Video Help: http://video.google.com/support/?fulldump=1
YouTube Help: http://www.google.com/support/youtube/?fulldump=1
AdSense Help: https://www.google.com/adsense/support/?fulldump=1
Analytics Help: http://www.google.com/support/googleanalytics?fulldump=1
Google Desktop Help: http://desktop.google.com/support/?fulldump=1
Picasa Help: http://picasa.google.com/support/?fulldump=1
Google Toolbar for IE: http://www.google.com/support/toolbar/?fulldump=1
Google Toolbar for Firefox: http://www.google.com/support/firefox/?fulldump=1
Google Earth (PDF): http://earth.google.com/userguide/v4/google_earth_user_guide.pdf
Google SketchUp: http://sketchup.google.com/support/?fulldump=1