ICv2 reports that volume 15 of Natsuki Takaya's Fruits Baskets, currently being published by Tokyopop, made it to No.5 on last week's BookScan list. Four volumes of Naruto also made it to the top ten.
Amazon.co.jp has released a list of the top 10 best-selling manga in 2006:
Volume 12 of VIZ Media's Naruto ranked #147 on this week's USA Today Booklist Top 150 (PDF) for the week ending December 3rd.
ANS reports that according to Tohan, Gin Tamashii 3 Nen Z Gumi Gin Hachi Sensei was the best-selling novel in Japan between December 2005 and November 2006: