Adobe's Flash technology is great for creating interactive websites, and sharing videos. But for the same reasons, it's also used for particularly distracting adverts that are harder to block.From Bruce Schneier's blog I now learn that they have privacy issues, as they leave 'cookies' that browsers currently don't know about or control. (You are blocking third-party cookies on your browsers, aren't you?)For Apple Mac users, there's a utility called Flush that quickly deletes them. I expect there's something similar for Windows by now.