Cheap flight notification (java web app)

The application allows users interested in flights to certain places on given dates to subscribe. If flights become available at the deisred price they will b notified by email. Flight availablity is determined using Amazon Turk service. Workers o the service will periodically check a list of flights and enter new flight information when found. The project was half started by a coder on this site, but he was'nt able to finish due to other commitments. I am also a java developer so can assist. So far there is: GWT front end and Guice/JPA backend. Mainly needs to have the whole thing tidied up and the turk intergration added.