Disco

Disco provides a remotely hosted Flash banner ad server and advertising management system.

More information about them, from the website:

It's providing both web publishers and advertisers with easy, affordable and powerful way to serve, track and manage the Flash ads. Disco users are able to display Flash banners on any website with just one line of HTML code. Geared specifically to demistify the Flash ad serving, Disco combines clear, understandable web-based interface with the robust backend engine. The system strictly follows industrial rich-media advertising standards, like IAB.

Not even sure if this is still around even though the website is still online. I'll pass, though.

Visit Disco Flash Banners