DNJournal (the domain industry news magazine)

domainIQ (internet research tool)

DomainTools (comprehensive DNS services)

DN Prices (database of 3M+ [premium] online asset sales worth $7B+ of deals)

NameBio (database contains 4 million sales totaling $2.4 billion)

History of Domain Names (history of the internet as it pertains to domain names)

howmuchisadomainnameworth (real data and real-world domain name valuation guidance for entrepreneurs)

Microsoft study on domain names (domain bias in web search)

ICA Experts Demolish Nine Persistent Myths About Domain Investors and the Aftermarket (domain investors)

Whoisology (domain name ownership archive)