I always go to YouTube itself, not try to grab from the embedded viewer. Ant puts an icon in the corner of Firefox and downloads at whatever resolution is currently being displayed. Easy puts a button on the YouTube page right next to the Share button and allows you to pick resolutions regardless of what's being displayed. It will also let you choose between FLV and MP4, and will save just MP3 audio if you want (handy for live music shows, etc.).
I usually preview the downloads before adding them to eMule. This time I didn't, so of course it's the time it fouled up.
