Though never on CNN, unless they're covering the journalism conference to which he was recently an invited guest - he spoke on a panel on 'blogging', of all things. The Raw Story
records some interesting tidbits - 200 visits to the White House, even on days when no press events were held, comings and goings apparently unrecorded - he often signed in but not out and vice-versa, despite 'tightened' White House security - and use of 'uncommon' entrances and exits.
EDIT: Perhaps I spoke too soon. The Washington Post
, despite being 'done' with this story, recently picked up an AP summary of these events. Check here
for their watered down version, if you like. The two make an interesting contrast, actually: the AP version is all of three short paragraphs long. The Raw Story story is two pages+, and links directly to scores of White House documents..