The Interactive Ad Bureau has judged that all current forms of online advertising, including banner ads, pop ups, flash ads, etc., are all ineffective, and they've recommended a new "Universal Ad Package", with (*GULP*) bigger sizes...
"We know that larger ad sizes work better," said Mr. Stuart. "Instead of having to produce for 15 or 20 different sites that all have different requirements, if agencies produce in these four [sizes], they're pretty much guaranteed to reach everyone."