It all depends what do you want to do to your intruder.
Option 1 --> secure your wireless network and forget about him
Option 2 --> Get a network sniffer and let it log all the network activity for a couple of days. Then scan the logs for passwords and personal information. Then own him so bad that he will not even try to thing again about using your wireless network... and probably no other unsecured wireless network.
Option 3 --> Install a transparent proxy on your network, so you can monitor everything he does and any page he surfs while using your net. You can even change pages and capture information on the fly from the transparent proxy.
I had so much fun with doing this to my neighbor, that I recommend it to everyone who has idiot neighbors in wireless range.
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