For this trip, I would grab them.
For future trips, follow JetBlue and JetBlueCheeps on Twitter. They tweet when a good deal has been released. In my experience, the good deals are released on Tuesdays.
I wish they would release a good deal for my summer trip. I paid $198 round trip in March. The same flights are $388 round trip for this summer.
Some people have suggested signing up for yapta, which will track flight prices for you. I have found a huge time lag between when the price draps and when yapta sends me an e-mail telling me about it. When JetBlue extended its trip dates recently, it took yapta several days to even allow you to track those flights.