WinDjView is a freeware DjVu viewer for Windows with tabbed interface, continuous scrolling and advanced printing options. There are other solutions for Mac and UNIX also.
This fast, compact and powerful viewer is based on free DjVuLibre library. It can show you pages one by one, by two or four. You can zoom in/out document's pages to fit in width, hight of your screen. There is a "magnifying glass" for details. On the left of each document's tab you can find thambnails of any page in order to make search easier. Also there are a lot of printing options, such as print range, select position, orientation, number of copies, paper size, scaled print to fit in your paper etc.
WinDjView runs fine under Windows. DjVuLibre library is for those who need a DjVu viewer for Linux/Unix systems. For Mac OS X you can download MacDjView which is a simple DjVu viewer also with continuous scrolling.