I played around with firebase and AngularJS over the weekend. Had a lot of fun, firebase was really easy to use (once I understand how the data was structured).

I open sourced the code as well: https://github.com/hswolff/bringthesalsa . Direct link to the app here: http://bringthesalsa.hswolff.com/#/ . Blog post here: http://harrywolff.com/weekend-project-bring-the-salsa/