I worked on version two of my app TwitterFitter, the tweet generator! New features:
- beautiful bootstrap UI
- you can now enter two twitter handles and it will combine the styles of both in its generated tweets
- you can tweet any of the generated tweets with one button, it goes to the @FitterTweets account
Definitely go play with it if you have some time. It's pretty fun, at least I think so 
Other than that, I learned how to do AJAX using JQuery.. I've only done AJAX the plain old javascript way before, and JQuery definitely makes it easier! Also, read a lot about Ruby styles and played with the Rubocop gem (I love the name). And I attended a few meetups, one on Ember, one on Sass and one on Ruby, where the speaker gave a great talk on the internals of the rails router.