I don't think its worth it for the individual but I guess if you are someone who isn't apposed to ads getting tossed a penny or two for your troubles isn't the worst thing in the world.

If their ad network does take off and a lot of people adopt the model, it could be a decent amount of buying pressure on Bitcoin as advertisers need to purchase funds to redistribute to users.

Ad networks are pretty much google and a few smaller players, so if someone can disrupt that I am all for it