ZDNET: “Top Ten Worst Spam Registrars Notifed By ICANN“:
The top ten ‘worst spam registrars’ are:
1. Xinnet Bei Gong Da Software
2. BEIJINGNN
3. Todaynic
4. Joker
5. eNom
6. Monker
7. Dynamic Dolphin
8. The Nameit Co/AITDOMAINS.COM
9. PDR
10. Intercosmos/DIRECTNIC
A discussion of the different metrics used and commentart on the methodology is at the ZDNet article.