Wrong modifier key!
Just found an error in Mac OS X 10.6 Snow Leopard: Visual QuickStart Guide. Not a biggie, but you might want to know about it.
On page 64, the third bullet point under Tips tells you to hold down the Option key to change the Clean Up command to the Clean Up Selection command.
That should be the Command key, not the Option key.
The correction also applies to the caption for Figure 11.
Sorry about that!