I wouldn't worry about it. It looks like Apple made some changes to /etc/rc.boot which has a hand in setting up single user mode. Somewhere along the line, the prompt just isn't being set anymore, and it defaults to displaying version info. If you want to change it, just alter the shell variable PS1.
You can have my iBook when you pry it from my cold, dead fingers.
iBook - The computer of choice for the enlightened CS major. Come on Apple, let me do a commercial. ;-)
"An alloc a day keeps the DRAM away!"