With the recent rash of SqueakSource/GemSource server downtime, I've bitten the bullet and updated the bootstrap process for Metacello to automatically switch to a secondary repository if the primary repository is not available. I also recommend that if you are maintaining a Metacello configuration that you update the class-side #ensureMetacello method for your configuration to use the primary and secondary repositories for loading the ConfigurationOfMetacello. A new version of the #ensureMetacello method can be found here (I've also updated the config template): http://code.google.com/p/metacello/wiki/EnsureMetacello If you are interested in using redundant repositories in your own Metacello project then you should take a look at this post: http://gemstonesoup.wordpress.com/2010/06/15/metacello-1-0-beta-27-unfurled/ as it describes the steps that you should follow. Dale