Art of the Title, a rather cool website focused on the art of main title design, has a terrific interview with creative designer Angus Wall, an Emmy-award winning title designer and recent recipient of the Academy Award for film editing. They go over the Game of Thrones title sequence in some detail.
Best of all, the article is heavily illustrated with concept art and high-resolution stills from the sequence. Plus, the highest resolution glimpse at the map that includes Essos ... including Essos’s eastern coast, on the opposite side of the Sunset Sea. This one’s so cool that we’ve added it to our Gallery, with some comments.