AbeBooks.com, a site for finding new and used books of all types, analyzed sales data from 2007 and created a list of the top collectible authors. JK Rowling took the top spot followed by Roderick Gordon, Brian Williams, and Stephen King:

On-going demand for signed Harry Potter books means Rowling tops the index although few first editions of her debut book, Harry Potter and the Philosopher's Stone, reach the market. An autographed Harry Potter and the Deathly Hallows sold for $5,500 just after its release last July.

If you're in the market for a signed Potter novel, we recommend you check out our friends at JKR's Army. They'll tell you what to look out for when shopping for a genuine JK Rowling signature. Thanks to Ali for the tip!

The CBS Early Show will be doing a piece on the growing sport of Quidditch on college campuses across the country this Friday morning. As previously reported in USA Today, Quidditch is becoming a very popular sport among college students and now the school that began it all, Middlebury College, is going on an eight-school tour during their spring break recess.

Starting tomorrow, they will be at Amherst College in Amherst, MA and that is where the CBS Early Show will be broadcasting from.

All the merchandise seen in the piece, including broomsticks, house ties and scarves, was provided by our partner Alivan's.

UPDATE: CBS News has posted video from today's earlier broadcast, which'll show you how to play. Check it out here! Thanks to everyone who e-mailed with the tip.

Have a friend or relative who's a Potter fan and still can't decide what to get them for Christmas? We're here to help - below you can find the top 10 selling HP items at Warner Bros. shop:

1.
Harry Potter "I Solemnly Swear...Mischief Managed" Transforming Mug
2.
Harry Potter Collectible Wand by Noble Collection
3.
Harry Potter "I Solemnly Swear" Adult T-Shirt
4.
Harry Potter Collectible Time Turner by Noble Collection
5.
Harry Potter "I Solemnly Swear" Woman's Fitted T-Shirt
6.
Harry Potter Dumbledore's Army Elite Messenger Bag
7.
Harry Potter Hogwarts Bookmarks Set
8.
Harry Potter Solemnly Swear Juniors' Hoodie
9.
Harry Potter Hermione Granger's Wand by Noble Collection
10.
Harry Potter's Light-up Collectible Wand

Get all of your HP-related Christmas shopping in soon through MuggleNet's longtime sponsor, Alivan's. As a MuggleNet visitor, enter the code NOCROWDS and save an additional 10% off any order between now and December 4th.

For this holiday season, Alivan's has added several new items, including the Elder Wand, exclusive Candy Potion Sets, Leather Wand Sheaths, and House Socks in all colors.

Also, don't miss your chance to pick up a signed copy of MuggleNet's New York Times' bestselling book, What Will Happen in Harry Potter 7. We only have a limited number of copies in stock, so order today!

We previously informed you about WB Shop's brand new Harry Potter hoodies, "I Solemnly Swear I Am Up To No Good." The hoodies retail at just $48.50 and will only be available for purchase through MuggleNet until October 29th! Click here to get yours in time for Halloween.

Warner Bros. shop has let us know that they now have available "I solemnly swear I am up to no good" hoodies. You can purchase the hoody right here.

Also, please note that if you spend at least $30 at the shop, you can avail of two-day free shipping, ensuring you receive your Halloween costume on time!

Our friends at Alivan's have told us that lots of their great merchandise will be featured on the TODAY show tomorrow morning in between 8 and 9:30 AM EST! There will be HP Trivia games, a book celebration, prize giveaways, and much more.

Warner Bros. Shop has opened a new Order of the Phoenix sweepstakes, and is giving MuggleNet visitors the first chance to enter. Up for grabs is a shopping spree at the WB Shop to the value of $500. The contest ends July 2nd. Good luck!

A detailed review of the new NECA action figures has been published online, along with some close up images of the products. Ratings are given for different aspects of the products, including packaging, sculpting and accessories. The reviewer awards the Voldemort figure three and a half stars overall, but Harry, the Death Eater and Dementor only three.

I really, really wanted to love these figures. In the package they blew me away, It wasn't until I had them open that some of their more glaring faults came to surface. In the end, I placed a lot of weight on the sculpt and paint, and didn't take off as much for articulation, value and accessories as I might have.

The figurines will be released this spring.

For their 2008 Harry Potter wall calendar, Borders is offering Harry Potter fans the chance to vote for the images that will appear in it. You can select five images from the Potter movies, including Harry Potter and the Order of the Phoenix, which is due out this summer. Voting ends March 15th.

Thanks to Helena, Karthika and Heidi for letting us know!

As reported yesterday, items from the Potter films were sold at the Bonham's auction along with memorabilia from other films, such as Star Wars, Titanic and the Bond series. Though only expected to sell for £3,500, Gary Oldman's (Sirius Black) grey linen coat, worn in Harry Potter and the Prisoner of Azkaban, sold for an amazing £15,600 (around $30,000). The price at which the navy linen cape, worn by Zoe Wanamaker (Madam Hooch) in Sorcerer's Stone, sold for was £950.

Cards Inc. has released some great new shots of the Snape action figure, due out this summer.

Remember that these action figures, and other Order of the Phoenix merchandise, will be posted on MuggleShop once available.

Deagostini will release a weekly HP chess magazine, and each issue will contain a chess piece inspired by the first Potter film. Each chess piece has "magical effects"; for example, the Rooks magnetically move with use of a wand (also included), and the Queen glows. Future issues also promise a free replica Time-Turner and magical floating pen. The first issue is priced at £1.99, and the magazine can be purchased only in the UK.

EDIT: The magazine is also available in Germany, Austria, Ireland, and Poland.

Thanks to those who emailed.

As firms continue to prepare to release Order of the Phoenix merchandise this summer, we now have some more information on various products. Figures.com has announced when NECA will be releasing their action figures, including the trio, Death Eaters, and Sirius. You can also now see some photos of new Potter masks (from Row M) and a new Hogwarts LEGO set, featuring Umbridge.

Thanks to everyone who emailed!

New merchandise for Order of the Phoenix was unveiled this weekend. A new line of toys and action figures were exhibited at the NECA Toy Fair in New York City (photos can be seen at Figures.com), and they are set to hit shelves beginning next month.

Thanks to everyone who e-mailed with the links!