The P7700's hot shoe allows for compatibility with Nikon Speedlights (SB-910 and SB-700) as well as the GP-1 GPS unit and ME-1 external stereo microphone.
Justice Samuel Alito agreed with the majority that Arizona's alien-registration requirement was void, but voted to uphold SB 1070 provisions making it a crime for illegal immigrants to seek work and authorizing warrantless arrests of certain aliens.