Why not use videodownloader 1.1.1? It is a plug-in for firefox that enables you to download from a number of video streaming websites like youtube, metacafe, iFilm, Daily motion etc etc... (They claim that it supports around 60 such websites).
Also, you can use it with netscape 9.02b (that is what I am doing) and yes simultaneous download is possible.
If you don't wish to download any software but still want to download videos simultaneously or one at a time then use:
KeepVid
That is what I use at college
hyeah: