I'm using it in conjunction with a firefox extension called Video Downloader (basically it lets you get video from say youtube, and then play it on your local pc)
I *think* it's registry free, but if someone could confirm that would be good (it's a typical install, then copy the folder and uninstall, and you are left withjust the program)
url for flv player is: http://www.martijndevisser.com/blog/article/flv-player-updated
I know that vlc player supposedly plays flv files (youtube and web site flash video) but I couldn't get either portable vlc or the full version to do so (I don't know if I'm missing a codec or something)
But flv player is fine, "it does what it says on the tin"
Provided of course... that it IS portable, please advise.