This site used to run on a low power VIA EPEA system put together from spareparts.
But things have impoved and for some time now the hardware consists of a dual-core system with loads of resources…but tweaked as much as possible to consume as less power as possible. That was mostly achieved by: spindown of harddisks, load-depending cpu throttling and removing some hardware that was not needed.
The server is running FreeBSD version 6.4, 7.2 8.0 8.1 with the usual Apache, MySQL and PHP/Perl stack and ofcourse some other software like Postfix, Dovecot, Squirrelmail and the Squeezeboxserver to stream audio to the HiFi set. …..and not to forget WordPress.
The server is theathered to the Internet via an 1Mbs uplink, but that should not be a problem: it only needs to serve up text/html as all images are hosted on Flickr and you will be using their bandwidth to pull in the images 