No longer a CDN, now a DDN

CDNs are content delivery networks.

DDNs are DoubleClick delivery networks.
Akamai is apparently both.
Former clicker, Eric Kirtcheff left Yahoo! to head there.
James Rooney was an SC at DoubleClick for about 10 minutes and went there.. 
Recently former marketing guy, Tom Burg, also heading there..
On their mailing lists, maybe there’s a “Clicker alumni list”