I recently decided to start a personal project using Raven Db.
It was surprising how easy it was to use. So easy that I actually felt uncomfortable about it.
Raven was super fast to set up. Code first was amazingly simple (nicer than Entity Framework).
The only thing I didnt like was the Silverlight interface. Call me old fashioned but I sort of like SQL Management Studio. It feels more robust than an in-browser interface. That's just me though.
Anyway. If you are working on a small project and want to be adventurous, then I a highly recommend you get out of your comfort zone and try out Raven DB. You'll be pleasantly surprised.