monitoring - Easy-to-use tool to monitor incoming network traffic

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Monitor all and any internet traffic from my home PC - what should I use?

On my Windows XP computer, I sometimes see the task bar network icon light up indicating that a bunch of information is coming in or out of my computer. Just now it happened, and was apparently a Firefox update (at least, Firefox wanted to update itself soon after the activity died down).

How can I conveniently tell right away what all the network activity is? I'm aware of Wireshark, but it's a little more low-level than I'm interested in for this purpose. (Or maybe I just don't know how to use wireshark well enough.) I'm hoping there's some tool that will figure out which address the bulk of the packets are coming from, and do a reverse DNS lookup to tell (if possible) what the source is.

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