Foxit Reader is the only eligible alternative reader/viewer for PDF files (eBooks). It's free, smaller, faster, and cleaner. And it starts up immediately, so you don't need to wait the annoying "Welcome" screen to disappear. Foxit PDF Reader is extremely easy to use, just double click it to start and then click open button to open your PDF document. If you want to print, click on "Print" button. If you want to setup the page layout for printing, select "Print Setup" from "File" menu. Foxit Reader supports Windows 2000/XP/2003/Vista/Windows 7. Unlike Adobe® Reader, this one has size about than 2.5 MB, needs no installation and opens up immediately. You don't need to go throught lengthy installation process to start using Foxit PDF Reader, just UNZIP the downloaded "pdfrd.zip" package into any place you want, then run PDFReader.exe. You can set Foxit PDF Reader as your default PDF reader, so you can double click on PDF files to open them within Foxit PDF Reader.

Google Earth combines satellite imagery, maps and the power of Google Search to put the world’s geographic information at your fingertips. Fly from space to your neighborhood. Type in an address and zoom right in. Search for schools, parks, restaurants, and hotels. Get driving directions. Tilt and rotate the view to see 3D terrain and buildings. Save and share your searches and favorites. Even add your own annotations. 

Google Earth lets you do smooth sailing flybyes of the entire Earth. You can easily fly to any spot on the globe, by entering any associated data, like street addresses, place names or lat/long coordinates. There are overlays that put additional information on the map, like roads, international boundaries, terrain, 3D buildings, crime statistics, schools, stadiums, any number of interesting stuff. You can do Local searches in the program, with icons on the map and a display on the side showing your results. 

You can leave notes, called "placemarks" all over the map, so you can remember where all sorts of places are. Searches and placemarks can be saved as bookmarks in "My Places". Everything can be output in an XML format called KML, that will allow the vast popularity of Google Maps to continue in Earth. You can also email a JPEG of the map, or send a KMZ file if you know the recipient has Earth installed.