How To: Simple Token Authentication Example

Here is a blog post with some quick code snippets and a link to a quick example app on github. http://zyphdesignco.com/blog/simple-auth-token-example-with-devise

And here is another blog post with a detailed example: http://matteomelani.wordpress.com/2011/10/17/authentication-for-mobile-devices/

There is a bug on Github that allows anyone edit page from another users.