Odds are it's the internet being stupid, but there are programs out there that let you monitor what's connecting to the internet. I know CounterSpy lets you see that sort of thing. If I happen upon any freeware applications I'll let you know what I find.
You might try resetting your cable/DSL modem, and rebooting your router as well. Sometimes that works wonders. I know occasionally cleaning your network cable contacts is a good idea too, especially if you're in a dusty environment and occasionally unplug the system for LAN's, etc. Just make sure you completely unplug the cable first so you don't create any short conditions. Just use a Q-tip and some rubbing alcohol, then let it air dry before reconnecting.
If you're on Wireless, God knows what might be messing it up. Radio interference, leeching... of course, if you're on Wireless and you have DHCP set up you should be able to go into your wireless router and see the MAC addresses of all the machines hooked to your network. If you see anything you don't own, then you'll know what's going on.
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