We've just launched our new web app seoprofiler.com after crawling the web for over a year (own crawler using the Amazon EC2 infrastructure). The submitted page shows some statistics that we've gained.
I can only speculate. We used seed sites from all American and European countries, including Denmark, so Danish websites should be covered. It might be the geo IP database that we use (maxmind.com), or there are really only 6 sites with more backlinks in Denmark, or Danish webmasters use other countries to host their sites.
http://www.seoprofiler.com/company/about compares to Google link: queries, which are indeed incomplete. How does your crawl compare to Yahoo! Site Explorer link: queries. The latter seem more complete to me.
SEOprofiler shows the backlinks only for the creativecommons.org subdomain, excluding support.creativecommons.org, wiki.creativecommons.org, search.creativecommons.org, de.creativecommons.org, etc. For this reason, the backlink number appears to be lower.
