Protecting My Daughter's Notebook?

ctwxman asks: "My daughter enters college in the fall. This past week she spent three days on campus for orientation... and had her iPod stolen! That got me to thinking about protecting her brand new laptop. I'll physically lock it to something immovable -- that's simple. However, I've got a website and it's got a log. Is there a way to make her laptop quietly 'phone home' every time it boots so I can get the IP address and always see where it is? Her machine runs XP, but knowing Slashdot, suggestions for all OSes will be appreciated."