Networking related programs

I started writing programs in Python to play with networking but I can't think of anything to do. I did a portscanner (it was with great restraint that I told myself not to scan Google because it's illegal) and was going to write a packet sniffer but decided it was boring. What other things could I write?

I was thinking at the moment to write something that follows all the links in a given HTML page and returns a list of broken links (links that result in a 404), or maybe something to find and download all the images on a website.

Any other ideas?
Scanning ports isn't illegal.
Without permission it is; according to nmap.org...
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Sounds likely to me that chrisname would be right... Atleast in the case with mad google nerds.
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