dude it's so simple.

first thing is that ur ipod comes with factory default to b syned automatically with ur itunes library. so in order to avoid the deletion of ur songs, first set it to manually sync. u can do this once u connect ur ipod and go to the ipod window.

second thing u can transfer ur songs in ipod to ur computer but for that u've to enable ur hidden folders. the songs are in hidden folders. then u can easily copy and paste all ur songs to ur computer.

good luck.