Just when you thought the search field was maturing, something new happens(thank god!). WhenU, a "desktop advertising network" similar to Claria--has just named former About.com CEO Bill Day as their CEO. Bill is not only a smart guy, he's one of the people who formed Sprinks, now a part of Google, which in turn spun off the new Kanoodle. Althought this is starting to sound positively bibical, it means WhenU merits watching...