Thanks to [metamac] for pointing out this:
[…] the economics of the Mac mini are such that for the first time ever there is a competitive Macintosh server able to handle more than 1000 hits per second yielding 20Mbits of data at a price that meets or beats much of the industry - and it all comes in an Apple package with their traditional emphasis on quality, style and Mac OS X’s UI. A great little server for the rest of us!
Sweet – Server colocation on Mac minis at [http://macminicolo.net/]. I’ll check if there are some friends needing a Webserver :)