Google Pack Comes Free with Google Earth
Google Pack is a bundle of amazing software that comes absolutely free with Google Earth. You can choose what software you want to download when you get Google Pack. You don't have to download it all if you don't want to. Just so you know how much more you get by just getting Google Earth, we've listed them all out for you.
Google Desktop (Desktop Companion)
Ad-Aware SE Personal Edition (Adware detector and remover)
Google Toolbar for Internet Explorer
Picasa (Photo Organizer)
Google Pack Screensaver (Screensaver creation tool)
Mozilla Firefox with Google Toolbar (Browser and search tool)
Norton System Scan (Virus detection and removal tool)
Adobe Reader 7 (PDF Reader)
Google Talk (IM and Chat program)
Google Video Player
RealPlayer (Media player)
Gallery Player HD Images (A Collection of free stock images)
Skype (Internet Telephony and the newest addition to the Google Pack)
All you need to get all of this is Windows XP and either Firefox 1.0 or IE 6.0 or higher to take advantage of all the fantastic software listed above.