Because they're still beautiful, here's the Web Trend Map 2007 Version 2.0 (below), and the Web Trend Map 2007 Version 1.
Via Strange Maps.
Xkcd presents a Tolkien-style Map of Online Communities, which handily situates social groups along the axes of "pratical—intellectual" and "focus on real life—focus on web".
There's also xkcd's nifty Blogofractal, which helpfully distills all the output of the Internet and crystallizes it in visual format:
In more practical maps, this one at Strange Maps is a world map showing all of the country code top-level domains (ccTLDs), weighted by population.
Here's another xkcd Map of the Internet showing the distribution of IP addresses.