Congratulations to us all - we're in the public phase of the beta, now.
So now we're here, what sort of level of question and answer do we want?
This is our chance to shape the site over the next few months. Anything we decide won't be forever: but it will help us in deciding which questions to close, which to re-open, which to delete, until we change the scope again some time in the future.
And although we grew out of an Area51 proposal, that site proposal was a long time ago: we've lost people along the way, and gained people, so now's a good time to reconsider where we are, and where we are going.
Some Stack Exchange sites, such as mathoverflow, choose to stick to research-level questions.
Some sites, such as English Language & Usage, allow all except beginners' questions and general reference.
Where do we want to pitch?