(Dit artikeltje is even in het Engels omdat het interessant kan zijn voor een internationaler publiek).
config.action_controller.asset_host = "http://%d.assets-blog.frank.be"
However, it seems that Mephisto or at least the Liquid templating engine it uses, doesn't use the standard Rails functions to calculate the asset hosts, it just constructs them by hand, which kind of sucks of course.
With the help of my colleague Jan, I've written a small plugin you can install that will use the distributed asset hosts feature. You can install it using the following command: