Maybe I'm just lazy, but the biggest impediment to using Datomic right now is that I don't want to deal with the hosting and configuration that's required.

If I could just go to datomic.com, log in and click "create new database" and call it "my_new_app_database" and then immediately use that database from my app that would be fantastic.

(In short, I wish there was a heroku for datomic... admittedly, paying customers probably aren't impeded by such newb issues.)