Continuous scrolling is very interesting pattern. If I would have to describe it in short I would say that new items are being loaded while you scroll down the content. If this sounds odd to you, don't worry. I thought it is absolutely crazy when I first read about it. But I realized people are amazed by this pattern after my session "ASP.NET patterns for better user experience" on MSDN Day in May this year. And let me just say that this pattern is used on Google Reader and Dzone.