You Know Me
Pretty cool. Eric's comment system has a "You Know Me" button and will import data from your FOAF profile. Furthermore the address of the foaf profile is retained for later exploitation (e.g. authentication of requests to modify entries?). My two cents is that autodiscovery is the next important step as I'm not convinced that entering the URL of your FOAF profile is any easier than entering the URL of your website.
As soon as I return from travelling, I plan to catch back up, implement this on my site and resume my status as early adopter/exploiter