One of the major companies offering channel marketers a consistant brand image and messaging is ZIFT.
The system they use is to develop a series of campaigns in the clients subject area which the agents then personalise with their own logo and contact details which they then send to their customers and prospects.
The Zift system then provides a code for inclusion in the agents web page which provides very powerful tracking information e.g. which emails were opened, what the following actions were and provides a scoring system so that interested prospects can be identified and followed up.
The following is an youtube video which captures some of the scope they cover
Onlinemarketing 