i saw that alot of you want to get more mp3's on portable devices like the iPOD or mobile phones.
look the easyest way is to reduce the BITRATE of the mp3 file.
128kbs is cd quality mp3
make this lower eg 96 or 44 will reduce the size of the mp3 u can go all the way down to 16 but keep in mind that quality is lost.
use programs like 'CDex' and experiment with settings on some songs to find which bitrate will suit you.