Or at least that's Blake's intention. He's doing it because he hopes "Drupal will increase participation and make LISNews easier to use".
As a user of Drupal since 2004 and now a contributor to LISNews, all I can say is, Amen. Data conversion is going to be a challenge. He's set a target for himself of the 8th Anniversary of the site (Nov. 2nd, 2007). In any case, good move.