so if i have a macpod, i can't install rockbox without erasing it which will erase the ipod software. that really sucks becuasae i really want rockbox.
You seemed to be concerned over the erasing of the ipod software, so...
Just to be clear, you would:
1 - format the player, erasing the ipod software,
2 - then you would use Apple's restore tool to put the ipod software right back on,
3- then you would install Rockbox, which can dual boot with Apple.
The only downside is the loss of music from your ipod (due to the formatting), which you can re add as soon as you complete step 2.