We're hoping to fly out of Detroit, but still haven't booked for our proposed last week of August trip. Mainly, we don't want to purchase non-refundable (therefore cheapest) tickets until we know the vacation is a go - and until a better discount comes out for our week, it won't be. The Free Dining news is hopeful though.
I have been keeping track of all the airlines though, but there hasn't been a truly amazing deal yet. I know that I've seen past fares as low as $59 USD (before taxes and fees) each way on Southwest. So far, the best offer I've seen is $74 each way - I think AirTran offered that one.
Mousesavers suggests that prices at six months out and two months out are often the lowest. If we can get the Free Dining (or something roughly as good), we'll hope that some good prices come out in June for August flights.