You would think this would be a fairly easy question to research, but after spending a considerable amount of time on the web, it is not. PLEASE LET ME BE CLEAR. I AM LOOKING FOR AN ABSOLUTE EXPERT ANSWER ON THIS. NOT FROM SOMEONE WHO "THINKS" THEY KNOW OR READ A FEW BLOGS LIKE I HAVE AND NOW THEY KNOW IT ALL. Forgive me for being so demanding, but for anyone who has searched for answers knows what I'm talking about.....Now that I'm off my soap box here's the question: I have a web site I maintain for my employer. I have some swf movies loaded on that site. What are the specific pro's and con's of swf vs flv. I think I have a general idea of the differences, but I'm looking for things like which is the smaller file size, does ie and firefox support both without adding plug-ins, do both begin playing before the download is complete, once they have downloaded do both formats remain in the browser so that if the person comes back it plays from the first download and doesn't download it from the site each and every time, etc, etc. I'm trying to decide which format I should be using but I can't find anything that clearly lays out in black and white the pro's and con's of each. thx much!