I just know how to dawnload FLV from Youtube.Add “kiss”. 
now,i am looking for a free flv downloader,which one is bettter? thank u for help.
posted in General
Some online conversion sites can download FLV video, such as Zamzar, Keepvid,etc.
Or you can use the Free YouTube Downloader tool to download FLV videos.
Yahoo search for you:
How to get youtube videos (flv) for free
Why don’t you search in google because google has a capability to search anything you want with less effort. You can also use other search engine like yahoo and other kind of search engine.
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Subscriptions People
Try leawo Youtube download, it’s totally free.