"Finally, we come to the alternative of hosting video
from our own servers. Although using a module such as Media Mover
combined with services such as Amazon S3 makes serving video a
slightly easier task than it might have otherwise been, for most
sites the bandwidth required for serving video is generally not a
viable option. Additionally, sites may wish to take advantage of
the viral opportunities of hosting video through a widely
recognized provider such as YouTube or Blip.TV."