Google Satellite Maps Downloader is a cute tool that help you to get small tile satellite images from google maps. All downloaded small images are saved on the disk. You can view downloaded maps by Map Viewer Or you can combine them into a big bmp/jpg/tif map.
If you use Tracky or some other GPS softwares on your PDA, it is helpful for you to download cache files on your PC. You can also use the offline maps in GIS softwares such like Global Mapper, etc.