Personal Productivity is now in public beta.
Therefore, if you see a question that might be on topic over there but definitely off topic here flag it for moderator attention and we'll take a look.
This doesn't apply to questions that could be on topic on either site (admittedly a small number) as there's always a chance that the site won't leave beta. However, if the question is definitely off topic and would otherwise be closed (and eventually deleted) then migrating it an option.
NOTE: Personally I'm not in favour of migrating old questions to a new site. However, new questions are always fair game.