There are many applicaitons for banner ads besides placing making media buys on commercial web sites. One way is to organize intra-site campaigns.  That allows site owners to track the efficacy of marketing initiatives among existing clients, customers, or site visitors.

Joe Spiers Custom Harmonicas landed virtuoso Jason Ricci and premier microphone technician Tom Ball as an endorsees.  By delivering their ads with MojoTool's ad server, Mr. Spiers is able to judge his endorsement program objectively.

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