Verisign publishes a domain name industry brief every quarter. The latest one is an interesting read.

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As of September 2008, there are approximately 168 million top level domain name registrations (including ccTLDs).
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There are about 65 million country specific (ccTLD) domain name registrations,
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As every one knows, the maximum domain name registrations are for .com
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There are more .de (Germany) and .cn (China) registrations than .net
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47% of all ccTLD registrations occur for DE, UK and CN domains.
Download the The VeriSign Domain Report – September 2008 (Current state of the domain name industry, including up-to-date trends in new registrations, renewals, and growth opportunities)
