MarketingShift went right to the horse's mouth to ask about the relative merits of Flash-based user tracking versus using the ubiquitous cookie - a topic of sudden relevance now that some third party companies are confirming Jupiter Research's recent finding that as many as 40 percent of user cookies get deleted. Dowdell asked Macromedia's chief technology officer Jeremy Allaire about whether or not Flash would be practical. The upshot: it's much better at storing much more data per user per site, but many implementations rely on javascript, which can make results fudgy.