Received some good response from this last week, so here I am again.
Let me know if there are any particular statistics you're interested in - I can try and find them.
This week, I've added links that lead to kakaku.com for each product. Kakaku.com provides extended information, user opinions, and lowest prices; I guess it's kind of like the Japanese version of PriceGrabber.

2004/8/16 ~ 2004/8/22

Category	Conse-cutive	Maker / Number	Release	Approximate Retail Price	Specs
Braun Tube TV	2	Sony / KV-21DA75	2003/9	Open	21" / No BS/CS Tuner
LCD TV	1	Toshiba / 14LS20	2004/5	Open	14" / No BS/CS Tuner
PDP TV	4	Matsushita Electric / TH- 42PX300	2004/6	Open	42" / BS Digital/110 CS Digital
DVD	2	Mitsubishi Electric / DJ-P230	2004/3	Open	DVD-ROM / No VHS

Category	Conse-cutive	Maker / Number	Release	Approximate Retail Price	Specs
Camera + Video	2	Sony / DCR-PC350	2004/8	Open	MiniDV / Memory Stick PRO Duo
Digital Camera	10	Casio Computer / EX-Z40	2004/3	Open	4.23MP / SD Memory Card
Notebook PC	15	Nippon Electric / PC-LL7509D	2004/5	Open	Celeron M 1.2GHz / No TV Tuner
Desktop PC	13	Nippon Electric / PC-VL5709D	2004/5	Open	Celeron M 2.7GHz / TV Tuner
Cellular Phone	12	NTT DoCoMo / N505IS	2003/12	Open	Production: Nippon Electric / 1.3MP camera

*"Consecutive" describes the number of consecutive times this item has been listed as a "No.1" since the start of this site in September of 2003.
*These rankings are brought to you by sales ranking data from the ACSISS-E3500 quantity. Generally, the sale of specific-store items (PB = Private Brand Model) is not included for this data.

Source:
http://www.gfkjpn.co.jp/report/no1.html


2004/8/16 ~ 2004/8/22

This week's four categories:
*Cameras w/ Integrated Video: DVD
*PC Software - Practical Use - Keyboard
*Home Bakery
*Cleaner

Items struck-through indicate categories I won't be covering. Please let me know if you'd like me to translate them, and I can. -zmcnulty

Category: Camera with Integrated Video / DVD

Rank	Maker / Number	Release	Approximate Retail Price	Specs
1	Sony / DCR-DVD201	2004/3	Open
2	Hitachi Mfg. / DZ-MV580	2004/2	Open
3	Matsushita Electric / VDR-M70K	2004/4	Open
4	Sony / DCR-DVD101	2004/3	Open
5	Hitachi Mfg. / DZ-MV550	2004/3	Open

*These rankings are brought to you by sales ranking data from the ACSISS-E3500 quantity. Generally, the sale of specific-store items (PB = Private Brand Model) is not included for this data.

Source:
http://www.gfkjpn.co.jp/report/ranking.html