In all the instructions that involve changing files under /system, I see that the first thing to do is to mount it as read-writeable, then at the end, mount it as read only:
mount -o remount,rw -t yaffs2 /dev/block/mtdblock3 /system
mount -o ro,remount -t yaffs2 /dev/block/mtdblock3 /system
However, I'm finding that I can read-write files in the /system directory just fine without all the remounting. Does anyone know what this could mean? My phone seems to be functioning just fine so far. Should I try mounting /system as ro like in the last step just to be safe?