Most of the online videos are served in flv container. While the container itself is OK it doesn’t have the same capabilities as an MP4 format. For example you cannot properly tag your music videos. In WinAmp when you click Alt+3 (view file info) nothing comes up. You can edit metadata, but they can only be saved for temporarily.
What you can do is to convert these videos to mp4 format without re-encoding, you will not lose quality in the process, as video itself stays the same.
Easiest solution for this job is to use Avidemux, an open source application.
After you download the zip file and extract its contents, open up Avidemux, drag and drop your flv file on it and choose mp4 as format, you don’t need to change any other settings, leave video and audio settings to their default, as copy.

Then save the video.
When you open you new file in WinAmp, you can easily add or change its tag info.

related posts:
how to wrap aac files into m4a or mp4 container
how to tag music files easily by using online databases

Both price per gigabyte for storage and price per megabyte/second for bandwidth is falling consistently. Apart from this there is also a surge in online music services where you can buy your favorite tunes for just under $ 1. But on the other hand there is also the irresistible sweetness of free music; internet radios.

Listening to the same albums and songs becomes boring after a while, no matter how great songs we have in our archives. That is if you don't pirated all the new albums that you can find. There comes internet radios to our rescue; both legally and tastefully.

If you like listening online radios but also want to save your favorite tracks for offline use there is an option for you. With incredibly easy to use Free Music Zilla you can visit a site with streaming audio like Pandora, Last.fm, IMEEM, MySpace, eSnips, or several others and Free Music Zilla will give you the option of saving each song you listen. Just install the application and it will hang out in your system tray.