Uppercut is a Backbone style model transport that's compatible with Knockout.
Project page:
http://toddlucas.github.com/uppercut
Source is located here:
http://github.com/toddlucas/uppercut
Annotated source is here:
http://toddlucas.github.com/uppercut/docs/uppercut.html
http://toddlucas.github.com/uppercut/docs/uppercut.knockout.html