bdLoad is is an AMD-compliant script-injection loader for loading javascript resources into the browser. Its design places a high value on minimum size and maximum run-time and build-time configurability.
A tutorial is available at http://bdframework.org/docs/loader/loader.html.
A complimentary build system is available at https://github.com/altoviso/bdBuild.
bdLoad has been in use privately since 2008 and its internal machinery is fairly mature. The project was made public in late 2010 and has been extended to include RequireJS compatibility. Expect a final, versioned release of bdLoad in January 2011.
bdBuild is free and open source software available under a BSD-style license.
bdBuild (the backdraft build program)