fubuvalidation.js is a JavaScript library that leverages jquery.continuations to handle server-side validation errors.
We're still working out the docs (as usual). For now, please go read Josh's write up: http://lostechies.com/josharnold/2012/01/06/our-ajax-conventions-the-ajaxcontinuation/
You may also want to checkout jquery.continuations: https://github.com/DarthFubuMVC/jquery-continuations