I am new at downloading music. The file types available for down loads. I am not sure what the formats are. eg., mps, wav, m4a, ogg. I know what MP3 is. I am wondering what format I have to download in in order to burn cd's to play in my car and stereo which do not read MP3 format. most of the music I search in Limewire is in MP3 format. Someone please advise me how to do this. It is probably very simple. Thank you

In gtk-gnutella, you can create a filter which will only display files with an audio extension, like mp3, ogg, aac etc..
Look at the gtk-gnutella website on how to create filters.

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Get a program like Nero 6, that will convert mp3's to wav. files so you can play them in your car.

You don't need Nero. Any multimedia player I know can write the audio output encoded as plain PCM to a file which can burned onto a audio CD. The best multimedia player is of course MPlayer which plays virtually any audio and video file that exists. Just be sure to install the real thing and not some politically encrippled version as found in some Linux distros.