Recunosc ca n-am citit pe Seomoz atatea, asa ca pentru unii probabil nu e nimic nou. Intr-un ghid postat de ei Domains - SEO Best Practices | SEOmoz, mi-au atras atentia urmatoarele , si am zis sa le postez si aici, contrar multor pareri care sustin ca extensia nu conteaza, limbajul pare usor de discriminare fata de orice nu e .com, .net sau .org.
Spunand ca unele sunt indicator de spam, ma gandesc ca asta inseamna ca ei considera ca sunt tratate altfel decat .com, .net, .org, altfel de ce le-ar numi "low quality TLDs".

Top-level Domain (TLD)
Top level domains (like .com) are the extensions associated with domain names. For best ranking results, avoid uncommon top-level domains (TLDs). Like hyphens, TLDs such as .info, .cc, .ws, and .name are spam indicators.
4. Non .com Top-Level-Domain (TLDs)

When a webmaster registers a domain name, they will be given the option to buy additional TLDs. In order to maximize the direct traffic to a domain, it is advised that webmasters should only buy a domain if the .com version is available. Additionally, it is not recommend that SEO conscious webmasters purchase low quality TLDs such as .biz, .info, .ws, .name, etc. as a means of increasing traffic.