These sites are all owned by people other than me, and people other than my friends. They are mentioned on their respective review pages, but I have compiled a list here because it makes it easier.
www.mugglenet.com This is the site where I get all my Harry Potter information. It's the largest website I go to, and covers everything from JKR's next tour to Emma Watson's next movie.
www.shurtugal.com All Eragon news (what little there is) comes from here. But it isn't their fault - HP is just a bigger fandom, with a lot more going on.
www.anti-shurtugal.com This is a site that talks about Eragon and Twilight, and the flaws of both. Even though I'm a fan of Eragon, it's still pretty eye-opening, reading the articles that are put up there. And extrememly funny. Beware, though - swearing exists, small children.
www.artemis-fowl.com Also known as Artemis Fowl Confidential (AFC), they have tons of information on all the books, as well as a great fanfiction section! Seriously, go check it out (and look for me, Salali, as one of the authors!).
www.fangathering.com This is my other Artemis Fowl site. I normally only have two sites I visit for my news, but both of these were so good that I just can't give either up. Fangathering (sometimes referred to on this site as FG) has many more games (Artemis style!) on it's pages, and their fan-art is absolutely gorgeous! Some of it, anyway...
inkweb.artemis-fowl.net An up-and-coming Inkheart site. I'm pretty sure it's affiliated with AFC, but they haven't answered me yet.
http://www.corneliafunkefans.com/mainSiteIEUSA.html This is a VERY big site, based on Cornelia Funke and all her work, unfortunately. But still, beaucoup de fun stuff.
I have been forced against my will to put links to my friends sites on this page. Some of them you may recognize from the guestbook (whether you feel required to go back to October when they last signed it is a different story).
www.freewebs.com/celeryseed If you enjoy random articles and rants, by Aolani.
www.freewebs.com/celeryseed2 If you went to my middle school, and absolutely hated it. Also by Aolani
www.freewebs.com/jango102 For all you computer geeks (not nerds) By... Soum
www.freewebs.com/spanishinquisition11 I don't think it really has a point yet, other than to worship the theatre. Created by Future Broadway Phenomenon, if you haven't already seen the guesbook. FBP, do you have to use such a big font?
www.freewebs.com/iluvdogs0310 This is more of a blog / not really. Cool sites "things before I die", etc.
www.freewebs.com/colonialunicorn One of my friends talks about all the clothing-alterations that she does.
www.freewebs.com/laxcordaxbond "The Interaction Place" I am telling you to post on the forums, becasue it is nice.
http://www.geocities.com/goingslightlymad3/ You really need to read the fanfiction on this site. It is really, really good!
www.jkrowling.com JK's site. The graphics are really cool!
www.alagaesia.com This is the official website for Eragon.
www.artemisfowl.com The official site for Artemis Fowl
www.eoincolfer.com This is the personal site of the AF author, Eoin Colfer (It's pronounced "Owen!")
www.corneliafunke.de/en This is actually owned by a friend of CF (as I don't think CF speaks English very well) but it serves the same purpose. You need to put the "en" at the end, because otherwise you'll be looking at a German page.
www.booksofpellinor.com For the Books of Pellinor series, by Alison Groggon. First book is The Naming.
http://www.jeanneduprau.com The author of the Ember and Sparks books.
www.philip-pullman.com The His Dark Materials author's site.
Gail Carson Levine She really has no official website, so I made do with a Harper Collins Children's Books one. The URL was so long, I had to put it into a link.
www.CrackpotHall.com The site of Ysabeau S. Wilce, author of "Flora Segunda: Being the Magickal Mishaps of a Girl of Spirit, her Glass-Gazing Sidekick, Two Ominous Butlers (One Blue), A House With Eleven Thousand Rooms, And A Red Dog". Most people just call it "Flora Segunda". It's an interesting website, very random.
www.shadowmancer.com The website of G.P. Taylor, author of Shadowmancer and Tersias the Oracle. Apparently they're making a graphic novel out of Shadowmancer...
www.google.com God's gift to modern teenagers
www.imdb.com The most complete movie site ever.