Few tips for an optimal viewing experience:
 Good Internet connection, be sure to have at least a 1Mbit DSL.
 Close all programs that may keep your bandwidth busy (downloads, torrents, etc.)
 Win users: install the latest Flash Player and Windows Media Player version.
 Linux users:install Adobe Flash Player, mozilla-mplayer and w32codecs.
 Mac users: If necessary, install Flip4Mac (here)