Great work from Pocket developer Steve Streza. Just install the package, and you'll be able to send messages to App.net users from the built-in Messages app. I'm excited to see what else comes out of yesterday's hackathon.
I didn't give a flip about App.net until the File API was released, and I saw that App.net isn't just trying to be a Twitter clone, it's trying to become a new sort of infrastructure for applications. I'm so excited about the possibilities, I'm considering learning the API and coding something myself.