When I was a kid my family had a neighbor with very similar symptoms. She was convinced that my dad was using our computer to interfere with her (cable) television reception.... I can only assume she lacked the intelligence to come up with more sophisticated or sinister theories. However, that was just what she accused him of. There was no web log involved, so I've no idea what all went on in her head. She also once accused my brothers and I of filling our squirt guns with bleach and destroying the paint job on her husbands car. However, the really creepy part was that she would stand on our driveway at night and stare at us though the windows, particularly at my dad when he was at work on the computer. In the day, she was continually watching out her windows, and several times when she saw my parents leave, she came over and started screaming at us kids... f**king scary when you're only eight years old!
Still, our house never burned down, and I think she was relatively harmless. Sounds to me like this neighbor of yours is decidedly more dangerous.
