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Lots of nice free open source web page designs at Open Source Templates. Great resource.
Mapulator is a mash up of the traceroute utility and google maps. Traceroute, for the non geeks, is a command line program that takes a destination URI or an IP address and outputs a list of all the IP addresses that a packet passes through on it's way from the source (your computer) to the supplied destination. Mapulator does this as well, but instead of giving you a list of IPs, it geo-locates the IPs and plots them on google maps so you get a visual of the route.
Very interesting. For instance, right now, data between my computer (in NYC) and tulip (in California) is going through France. Data between my computer and ash (also in NYC) is going through Kansas and North Carolina.