There was a glitch and the template tag the_ID() wasn't in the distro. It just got included, aswell as the tag permalink_single() that makes a link to a post, long version, with comments.

For those with already running b2s, check that minor fix in the config file, to fix a sunday problem on the tag the_weekday().
Instead of re-downloading b2, you can copy and paste the new code of b2template.functions.php, there.