A Google AdSense Help thread has several publishers ranting about the lack of contextual relevance that the Google AdSense flash based ads have towards their content. They say that the image ads and text ads are more contextually relevant, and thus they want to be able to block out the flash ads from displaying on their site, all together.
Currently, the only way to block flash or animated ads is to block all image ads. Blocking image ads is not something all publishers want to do. Some want static image ads and at the same time, they don't want flash or animated ads.
The poll below asks if you think Google show allow for blocking of static ads versus animated or flash ads.
Forum discussion at Google AdSense Help.