The Rdio Model
It's been a blast watching Rdio evolve over the past two years. They iterate often and aren't afraid to changing the status quo. Through their efforts, I've discovered a product model that I will be testing soon.
Create an exciting product.
Use simple, flat, minimal aesthetic. (easy to understand)
Get substantial amount of users onboard.
Start iterating on your design. First relatively small changes once every 2 weeks.
Back to smaller changes every 2 weeks once smoke has cleared.
Now, things get exciting...blank space. Space that can be used to make larger changes on a weekly basis without losing a bunch of you users. A testing ground if you will.