Wife bought new MacBook Pro, so I took full ownership of our beautiful 20" iMac (Intel CoreDuo) ...

Problem: main account settings (SHORT NAME) under her name. Thought I could ignore it. But it finally got to me. Why can't the bloody thing just show MY name in the account short list?

Tried establishing a new account (under MY short name) and switching over our iPhoto, our iTunes, documents, settings, applications, etc. etc. -- I spent 45 minutes and barely made a dent.

Downloaded and installed ChangeShortName, and ran it under the Admin account, using the OS X GUI (I'm much too chicken to enter Terminal.)

Much nail biting: it felt like I was performing brain surgery on my iMac. After logging out of the Admin account, OS X wouldn't let me log into my wife's OLD re-named account. Intense fear. What's going on? A few moments went by where I thought: MY GOD WHAT HAVE I DONE!???

Re-start the system. Log into my NEW SHORT NAME ACCOUNT (formerly my wife's).

Everything's peachy! Smiles all around. Had to direct iPhoto to the photo library on the hard drive, but that was the only hiccup. iTunes, MS Office, iPhoto, etc. etc. -- everything works 100%!!!

Main advice: follow the instructions in the .pdf file VERY CAREFULLY. If you use this utility properly, chances are you'll be OK.