Question: does the choice to use subdomains or subdirectories affect the stats that appear on traffic measuring sites like Alexa?
It affects some of the measuring sites, and web crawler speeds etc. Now Alexa implicitly says it doesn't affect their stats, but it would be nice to know something about their algorithm for distinguishing "recognized personal pages": http://www.alexa.com/site/help/?index=12 (edit: corrected the link to point to traffic rankings faq)