My former company had created an elaborate template for the ad serving software Doubleclick for Publishers that delivered a frequency capped pushdown. The authoring tool was Edge Animate. Coming form Flash I was frustrated by Edge. I just wanted to be able to load sub SWFs.
Until I realized I could not only iFrame anything, unlike with Flash, cross domain was not an issue either.
sym.$("Box").html("<iframe width='1320' height='380' src='http://***********/iframe.html' scrolling='no' border='0' border='no' frameBorder='0' ALLOWTRANSPARENCY='true'></iframe>");
For hand coding gurus I like what Ad Form is doing.
http://studio.adform.com/