One of the best things about a good series is the world building. Some authors have created such complete worlds that they cannot put all of their ideas and stories into the actual books. I love it when this happens 'cause now a days they tend to create online sites for all the extras! To me reading through some of these sites makes the books that much richer and more complete. Chalk up another plus for technology. Here are some of my favorite extra's sites.
The Harry Potter Lexicon - This all inclusive website gives us page by page info, extras and links to even more Harry Potter goodness. There is so many cross links and rabbit hole possibilities that I can (and have) spent almost as much time clicking through the site as reading the books.
Pottermore - Just like the name implies, this site is more of Harry Potter. More illustrations, more stories, more details, more interactions. It is a great way for those of us who love the series to continue to explore the rich wizarding universe.
InCryptid Field Guide - This handy little field guide give those of us who want to delve into the varied and rich history of Cryptids in Seanan McGuires IncCryptid world need look no further then her website. Add to this a great listing and description of the series books and a whole TON of short stories (seriously gonna have to take a sick day to read them all) makes this site a massively cool extension of an awesomly great series.
A Wheel of Time Wiki - Anybody who has read the Wheel of Time series can tell you that as awesome as it is, a guide is definitely needed (unless you have a photographic memory) to try and keep the people, cultures, places and story lines straight. I had a friend who tried to do this using colored pennies but had to stop after he almost when bankrupt (teeheehee). This guide is much easier and bit less bulky.
Tolkien Gateway - When Tolkien wrote his famous Lord of the Rings trilogy, he intended it to be one piece in a larger mythology...that he then proceeded to write. If one has the time and enough pots of coffee you can discover on of the most detailed worlds in literary existence, with each story and character linking to each other in fantastic ways. This wiki helps us keep all the strands of this beautiful tapestry from getting to tangled.
Dragonriders of Pern - One of my first introductions to a series where the world was as important as the story and characters, the books of Anne McCaffery and Pern in particular have inspired my imagination and fueled my devouring of books like no other series. This wiki gives us just a bit more information, and a bit more time in the world I love so very much.
There are a ton other great sites dedicated to other literary worlds of awesome that I can't wait to explore...so off I go down the rabbit hole, you all start on these and we will meet back here and talk ok? Happy Reading Everybody!