I think all of these are great ideas for startups to pursue. The wide range of ideas presented in this write up show how diverse the problems on the web are, which presents plenty of opportunities for startups to fix them. #12 particularly stood out to me. I think that with the direction a lot of the resulting startups will take, new ways of advertising should follow. This one of the areas where theres room to innovate the most, because theres more to advertising on the web than "ads by goooooooogle".