Bulk Youtube Downloader?

I had one before, but I didn't used it and now I do not know where is it. I'm interested in which tools you use to download several videos at a time? Are there any free (or cracked) bulk youtube downloader? Thank you

this freeware can do the trick: http://www.dvdvideosoft.com/products/dvd/Free-YouTube-Download.htm
you can download any yt playlist as well, not just several videos at a time