I love coming across new ideas like this.  I was reading an article where a company called Interference, Inc. creates ads where there were no ads.  They carved out a new space, a truly new advertising medium.  This can be called guerilla marketing sice the space is not really rented out, it could be the side of a building or a bare wall inside a bar.  Right now the press on this idea is getting the true ad impressions because of the novelty, let’s hope it succeeds.

In another scenario an E-mail Ad Server company called Impactia is serving text ads into corporate e-mail’s.  So imagine if you are El Al Airlines (Happy New Year BTW) and your customer service person has just completed a phone reservation.  Customer service sends the customer back an e-mail and in the e-mail are 3 text ads with other offers from El Al on other flights.  Impactia is seeing 5-7% Click Through Rates on their text ads in e-mail’s.  They have about a dozen or so customers, keep an eye on this company.