Is there any way to measure viewthrough response from a banner ad campaign using Piwik?
Click-tracking appears to be supported but the way this works in Omniture and Coremetrics is that a visit that has been exposed to a campaign can be classified in terms of that ad.
Omniture does this through a Genesis integration with specific ad servers involving a real-time handshake and a daily sync. Coremetrics does this by creating a tracking pixel with associated campaign meta information.
If anyone is interested in collaborating on this let me know.