YouTube playlist is a features that Google developers have to implement on the most popular video site. But still now is not available and I’m not saying impossible. Visiting PlisTUBE website you just have to search for the name of your favorite artist and automatically comes available a playlist with his/her best videos, also you could add more videos very easy, quick and without interruptions.

If you like AC/DC here is their playlist with 19 videos.

MassTube is one of the most powerful in Spanish for downloading video from YouTube.com

MassTube supports the following formats: MP3, OGG, MP4 (iPod), 3GP (mobile), AVI, FLV, SWF and MPG (v1 and v2).

Download MassTube

via adictos.us

This free software will let you search ‘YouTube’, ‘DailyMotion’, ‘MetaCafe’ and ‘Google’ videos without opening your browser and you can even watch the videos using the built-in video player.
Free FLV Converter allows you to easily grab and save desired video. This software can convert the videos to Avi, Ipod, Iphone, 3GP or Psp format.
This software can also convert all your videos (divx, xvid, mpeg, dvd, avi…) to FLV video (Flash video) with an automatic HTML page creation. You will only have to place the files on your website to share your videos with the entire world.

Download Free FLV Converter

If you want to see a music video, there’s a good chance you’ll find it on YouTube. The downside is that YouTube doesn’t offer any music-related feature, so you can’t find information about the artists, lyrics or concert dates.
A simple Greasemonkey script adds one of these missing feature: lyrics. The script creates a container titled "Lyrics" below the video’s description and shows the lyrics when you expand the container. Obviously, the video must contain the artist’s name and the song’s title. If the script doesn’t find the lyrics of a song, change the site that provides lyrics (lyrics.astraweb.com seems to be the best) or choose from one the alternative songs.
As usually, to install this script you need Firefox and the Greasemonkey extension.

{Via googlesystem}