Here are posts dedicated to using the advanced features of Nikon Speedlights, Canon Speedlites and big flash too.

arrow Fashion influenced portraits arrow Canon & Nikon TTL flash compared
arrow How to shoot winter weddings arrow Nikon SB-900 v Nikon SB-800
arrow Make the world your studio arrow Phase One 645AF & P65+ review
arrow Two point lighting techniques arrow Canon 580EX11 or 430EX11?
arrow Using Speedlites in manual mode arrow Using Speedlights and triggers
arrow Notes about contrast in lighting arrow High Speed Sync with PWs
arrow Low light shooting at weddings arrow The Colour of Light