I didn't think this sleuthing would take on such global momentum. Reviewing our last couple of weeks downloading videos, me downloading numerous programs trying to conveniently convert video files, emailing large files, and SWMBO on skype to London (I thought it was once only) we can draw our own conclusions.
I have been a long term user of Tooble until recently. It appears medieval copyright policies have stopped it also and for the above job I used
Free Online YouTube to MP3, MP4, 3GP, FLV, AVI Converter It's not ideal and is effectively done online but it worked for me. I never know what to do with the file in the activity window on my mac; I need to find out.