I just received an email from CDjapan with a lot of links, including to the 2008 Top 100 of CDjapan!
1. the gazettE -Tour 2007-2008 Stacked Rubbish Grand Finale (DVD).
2. Dir en grey - Glass Skin
3. Utada Hikaru - HEART STATION
4. Ayumi Hamasaki - A Complete ~All Singles~
5. KISS - Jigoku Retsuden.
for the entire list, check
http://www.cdjapan.co.jp/offers/charts/2008.html 
Congrats Ayu!!! Congrats Hikki!!!
They sold very well outside Japan! Great
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Also, a fun bonus:
Top Selling Jpop Releases with External Bonus
1. Ayumi Hamasaki - GREEN/Days.
2. alice nine - Vandalize.
3. D'espairsRay - Horizon.
This is NOT the best-selling single of the year; just the current best-selling item that comes with an external bonus, such as a poster
Check the entire list here:
http://www.cdjapan.co.jp/offers/exte...nus/index.html