io9 posted a great primer on the most popular fan theories about George R. R. Martin’s epic fantasy series A Song of Ice and Fire yesterday. Keep in mind these theories all refer directly to the books, not the HBO show Game of Thrones, and contain pretty massive spoilers.
It’s definitely worth a read, especially for someone who has just read the books for the first time.
A Song of Ice and Fire is complex enough that it’s very unlikely any reader will notice all of the hints and clues and puzzles Martin lays out with just a single read through, so a post like this (with links to in-depth articles on the Westoros forums) is helpful if you’re interested in learning more and aren’t afraid of spoilers.
The series itself has become big enough by now that some of these fan theories have likely eclipsed the plot of the actual books in complexity, but it’s still a fun diversion if you love you some ASOIAF.