I just make a happy discovery: Flash stores videos it’s currently playing (eg. from YouTube, Megavideo, etc) within the
Access it by hitting Cmd-Shift-G in Finder, typing in
/private/var/folders and hitting enter, then navigate around until you see something like a
TemporaryItems folder – within will be a file called something like
FlashTmp0, which is the
Copy it somewhere and rename it, and it’ll play in VLC or any other player that supports the format (like Quicktime etc with Perian installed).