I restored my iPod and re-jailbreaked it, and now my RSA host key is different so I can't access the system through SFTP. How can I manually browse the system files without using this?
Go into Terminal.
type 'cd' : this will take you into your home folder. Alternatively, type 'cd /Users/<your username>' (replace <your username> with your username)
type 'cd .ssh' to enter the ssh directory which is hidden (a dot before the name means hide me)
type 'mv known_hosts known_hosts_backup' to rename the known_hosts file which effectively disables all previous ssh keys (rather than delete, rename for possible later use)