... go here ...
http://keepvid.com/
Enter the URL of the Youtube video and you save the "HQ" version ...
There is a good 'Free' .FLV converter out there too, (havn't got
the URL to hand), but HAVE tried both and they "do the job" OK
/On "KeepVid", if the YouTube URL is, say .... uk.Youtube.com/.....
you must DELETE the uk. part before copying the link
into KeepVid....
EDIT ... OK, I see Mr. Fango has already mentioned KeepVid,
but the .FLV files converter is at ...
http://www.koyotesoft.com/indexEn.html
... I have an "Earlier" version ... V5.2 or summat ... so have NOT
tried the download currently on the site, V6.7 ...