Alex, I'd love to hear how you did that for easytweets.com. Looks like you have a broad collection of features. How'd you decide which were core and needed to be put in before launching and which could wait?
There are tons more features we will add - and a lot more that I'm sure we will add that we don't even know about yet. I am trying to constantly keep my ear to the ground and listen to my users and influential folks in the search marketing industry and trying to prioritize what needs to be done based on feedback and my own daily use of the app.
It's kind of the whole premise of what PG says to do - launch early, and listen to your users. Many startups change their whole model after they launch. We now offer many features I would have never guessed when we launched the app last year.