GitHub (itself) makes Electron: http://electron.atom.io/, which like node-webkit allows you to make desktop applications with node.js and a Chromium-based browser.
I think that there's a bit more separation of the node.js and browser code in Electron than there is with node-webkit, which is probably a good thing.
Here's a Meteor package to help you integrate Meteor into an Electron-based app.
https://atmospherejs.com/jrudio/electron
I haven't tried or tested this solution, but it should give you a good start.
