PhysicsOverflow has been doing marvellously well now, and most, or rather almost all, of the activity is in the Q&A section (as opposed to meta). The number of visits is steadily increasing, and will probably cross 400 permanently this month. The highest ever peak was almost 1200, and occurred a day after Lubos's TRF post.
However, meta is getting ignored too much in my opinion. Bugs and feature request do get quick answers (from admins) but discussions are going way too unnoticed. This hinders the progress of the site.
Furthermore, the first phase of the Reviews section, Reviews I, is up, and it's time that the reviews activity appears on the main page, so that the Reviews section gets started, not just theoretically.
So I propose that we now change the main page to /activity. It wouldn't be troublesome as most of the activity is in Q&A, anyway.