Easter is one of the busiest times for air travel and I guess the airlines know that anyone booking now is desperate so they can charge what they like.
Just returned from NYC, I used Letsgo2.com who laid on fab hotel in Manhatten, and flights with Continental Airlines, better priced than anyone else. Easter will be dearer than the norm. Mail me - [email protected] - if you need any help.
Try travelsupermarket.com as that will search lots of airlines at once, saving you lots of time and finding you a good price. I would also recommend Southall Travel for flights (put them into Google). Their service is not great but they offer some fantastic fares.