No need to use anything to download videos from YouTube: just look in the /tmp directory after the files have been buffered to your HDD (i.e. after the light-red bar has got to the end on the YouTube browser page) and you'll find a big file in that directory. Copy it wherever you want. For example:
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$ cd /tmp
$ ls -la
$ cp FlashlbYolv ~/Desktop/Minha_Menina.flv
The global USE flag win32codecs should be in /etc/make.conf in order to switch on support for decoding avi files in multimedia packages subsequently merged (compiled) that require that particular USE flag in order to support various codecs. But I expect that the win32codecs USE flag is already in the SL 3.5 /etc/make.conf file and that the Entropy binaries for the various multimedia applications have already been built with that USE flag in /etc/make.conf. I don't use Entropy, so you'll have to check.
I've just merged vlc-0.9.2 and it plays the AVI files I have on my HDD. I can also play them using smplayer-0.6.2. Note that AVI is just a wrapper for video and audio files encoded using various codecs. For example, if I hover my mouse pointer over one of my AVI files a pop-up box tells me that the video codec is XVID and the audio codec is MP3. See the Wikipedia article on AVI for more details. It could be that the AVI files you're trying to play have been encoded with other codecs.
EDIT: I've just tried to play Flash video files (flv) with the following media players on my PC, and they all can play the flv files: SMPlayer, Kaffeine, KMPlayer, Totem, MPlayer, VLC, xine.