https://github.com/Q42/q42.nl/blob/master/server/blog.js

Actual Tumblr blog:

http://blog.q42.nl

When you first load the blog, if there are no posts, it fetches them with the API and puts them in our MongoDB, which is synced to the client's minimongo store by Meteor. Since everything is reactive, if we post a new post, it will automatically show up without visitors having to refresh the page.

So far we're very impressed with Meteor, our main site at q42.nl runs on it too. Try it out yourself: http://meteor.com or join a meetup: http://meetups.meteor.com