Most of the people visit their favorite site regularly if you want to see your favorite site in one window. Viewista is a free web service that allows viewing of multiple web pages simultaneously in one browser window.
For viewing sites you just simply enter the url of your favorite sites and select your view mode. View mode provides different type of modes like slide show, vertical, two column and horizontal. You can add 10 sites at a time.
It also provides short url these short url can be shared with others. They can view all the pages simultaneously in one browser window. Users can save or bookmark multiple web pages in their online account.