2 main models as with the 350z - base and GT pack. GT pack adds leather seats, better stereo and cruise (as with the 350z). Connect Premium is the upgraded entertainment system which adds touch screen nav and better ipod integration and HDD "jukebox" (can rip CDs to MP3s upto 10GB).
Ultimate was the first MY09 offer where you get a fully loaded 370z (nav, illumiated kick plates, etc) all included in the price and available in yellow with or without stickerage.
40th/Black Edition was the MY10 special which came with special red interior, callipers, dark wheels and limited numbers (370 for the whole of Europe)
GT Edition is the MY11 special edition which comes with revised suspension for the UK, better sound deadening underneath and a sticker down the side.
Think that covers it