I already wrote about Firefox release of 3.5 RC version in which i talked about some of its features and private browsing. The pic below from that post only illustrates it better. Take a look.

Firefox 3.5 Features
Firefox 3.5 Features

Well, the above image tell about some of the new features. For more elaborate feature details and to see whats new in firefox 3.5, Mozilla posted a You tube video on their webpage. Its quite good and illustrative. Take a look below.

httpv://www.youtube.com/watch?v=k5Zbc-Rg6e8