Nudge
NuHTTP includes a simple example that shows how you might use it to build a web application with Nu. Here's another, and this one includes CoreData. It's very preliminary, the roughest code that I've posted so far, but it's also something that I hope will get a lot of use.
Nudge is an issue tracker that I am writing to manage my Nu projects. I also intend to integrate it closely with git. But right now, it's just a place where I can keep my todo list for Nu. It's a build-as-we-go project manager for Nu.
I've put the source code online at code.neontology.com. Use it as a reference if you want to try to build your own web apps with Nu, or dig in and start helping me build Nudge into a full-featured project management system for git users. Either way, it's there, and it's released under the same license as Nu.