Lame is a good mp3 compressor if you want mp3's, though mp3 is fading away and being rapidly replaced with various AAC (Advanced Audio Codec).
LOL, what planet are you on? AAC is more advanced than MP3, no doubt, but to try to say that AAC is rapidly replacing MP3 is a fantasy. It has been 6+ months since you posted that and MP3 is still dominating.