Western Digital My Book Premium 500GB USB/FW 400 Ext Hard Drive
Good for media but not for OS or programs
As the earlier reviews mentioned it is easy to use and the documentation is only 2 pages.  It works fine for media files but it isn't very good for backing up the OS or programs files.  The software although easy to use is a bit sloppy.  During a backup if it finds a file it doesn't like for one reason or another it kills the entire backup and you have to hunt down the \\"bad\\" file and fix or remove it.  After 5 days of trying to get a 40GB backup I've had to resort to moving them folder by folder.  It also will not work if you don't have XP service pack 1 installed.  You may want to consider a spare HD, external case and a main stream backup software program.