Only one week ago, I've announced the FAI.me build service for creating your own installation images. I've got some feedback and people like to have root login without a password but using a ssh key. This feature is now available. You can upload you public ssh key which will be installed as authorized_keys for the root account.
You can now also download the configuration space that is used on the installation image and you can get the whole log file from the fai-mirror call. This command creates the partial package mirror. The log file helps you debugging if you add some packages which have conflicts on other packages, or if you misspelt a package name.