How do I change the name of my computer?

When I got my replacement iMac today, I used the migration assitant to move files from my PowerBook to my iMac, and didn't realize that it used the name "Corey's PowerBook G4 15"" for my iMac G5...I'm sure there is a way to fix this, I just don't know how to do it...any help would be great.

On a side note, this new iMac is sweet. I had the Rev A iMac G5, but due to a reoccurring problem, Apple finally gave me a new machine, and it just so happened to be the newest iMac...love it!

 

Thanks a ton...I knew there was a way, I just couldn't remember how to do it!