heres another tool: VideoCacheView

http://www.nirsoft.net/utils/video_cache_view.html

btw i think some of the Firefox extensions should be removed as they no longer work with many sites and are not being updated anymore.

Web Video Downloader for Firefox

http://www.listentoyoutube.com/

UTube Ripper

Open Source, can download and convert.

btw i think some of the Firefox extensions should be removed as they no longer work with many sites and are not being updated anymore.

Indeed. Idem for the "Sites", the 1st 3 I clicked are dead.

+ I found one more site yesterday; paste Youtube URL and download the MP3 (even if longer than 10 minutes).

http://www.flv2mp3.com/

Yeah, the landscape changes quite quickly in this arena and these sites/tools either have trouble keeping up or just outright die

For MP3 here is a decent guide using VLC: http://www.howtogeek.com/howto/2719/how-to-convert-video-files-formats-to-mp3-with-vlc/

And for Youtube you can try this one which seems to be effective even on sub-sites like Vevo:

https://addons.mozilla.org/en-US/firefox/addon/easy-youtube-video-downl-10137/

http://www.clipconverter.cc/

I did some more searching and ended up with ClipConverter.cc. It was elegant and simple to use. Provide it with the YouTube url and it'll give you the option to download or choose from 11 different formats to convert it to (mp3, aac, wma, m4a, ogg, mp4, 3pg, avi, mpg, wmv, flv).

http://feeds.hd-trailers.net/~r/hd-trailers/blog/~3/WSQ2SzOwNnc/

Anything for this type of video (a bit less than an hour long)? The link might be valid for a week only.

@Ponch: that particular video is blocked in the USA but I was able to download other videos from that site with JDownloader. Just copy the URL and it parses out the download fine.

Anyone had luck with videos from nfl.com?

Its very difficult one. Windows Applications that downloads YouTube videos as like it same

I personally use this video downloader

ChrisPC Free YouTube Downloader Converter is a powerful software with a friendly user interface that allows you to download videos and playlists from YouTube, videos from Dailymotion, Vimeo, Veoh, MyVideo.de, Flickr, Metacafe, Blip.tv, LiveLeak, Break, Trilulilu.ro, 220.ro, Tare.ro, Adult sites and many more video websites. Once the videos are downloaded, you can convert them to formats compatible with iPad, iPhone, iPod, MPEG-4 H.264, MP3, AC3.

http://www.videoyoutubedownloader.com