If you're going to use a neighbor's open wifi connection, it's probably not a great idea to share your iTunes library. I opened my network a few days ago because I was having trouble getting my Powerbook G4 online; I couldn't get it to connect using any of the password-based security schemes. I thought I turned on MAC filtering, but the netgear router adminstration page was a bit confusing -- it shows a "Wireless Card Access List" but doesn't actually do MAC address filtering unless you've checked a box above the access list. So I thought I had a closed network, but I was wrong. Fine, I deserve to have neighbors find and share my connection.
And then I launched iTunes and saw "Ernesto's LimeWire Library" under the "shared libraries" tag. (Not really his name.) Bwahhahha! Apparently Ernesto found my open network! I bet he had no idea that he was sharing his music.
I returned to the netgear router admin, actually turned on MAC addr filtering, and bye-bye Ernesto! Whee! Now he's looking around going, damn, what happened to that open wifi?
This is a nice feeling -- I did something kind of mean but I had every right to do it. That is so rare!