i need a software that can download a large no (say 20-30 vids) of youtube videos at one go.Should be compatible with vista.
use real player 1 (or 11 beta if final still not released)…you can download youtube or any other flash video right from browser with this…
use Orbit Download manager to grab video’s 
Orbit Rich Media Downloader:download social video,music and more…Pandora,YouTube,Yahoo,Myspace,Dailymotion,RapidShare…
^^ +1 for orbit. works flawlessly, and is fast too
use vdownloader…its only 3mb’s
google it to get d links..
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 
wow.. just downloaded orbit downloader v2.4.2 and it rocks man! go for it!! 
EDIT: too bad it doesn’t have hibernate after download option 
yea..me too tried Orbit n its gr8
use Vixy.net to convert online & download …
Miro - free, opensource and video player
Use Ultraget dude, it has the shutdown option and can also login to you youtube account (for age conformation that is needed before viewing some videos)
UltraGet Video Downloader : Download and play FLV video files from YouTube.
use keepvid.com to get the download link of the video
orbit or free download manager 
I tried out Real Player 11 & it’s so good at extracting videos from everywhere. It’s cool. See any video on ur browser, get it. Isn’t it Simple? try it out.
Orbit grab++ function works the same way too
That site does not open anymore for me
vixie.net says servers are busy.
There is a site javimoya.com to get download links of online vids. but its so overloaded and often results in an error. hence its recommended to use seperate utilities for the purpose…
keepvid has always been availiable upto recently and i’ve preferred it to installing any software that has to invariably be constantly updated.
heh.. only a couple of clicks is all I need to download a video using Orbit downloader
Ya tried orbit. Loved it.Thx!!