For me, anyway. Farecast now provides airfare predictions for a whole bunch of markets, instead of the handful it had during its testing phase. Of course, the Summer Of Neverending Travel is just about over for me, so I no longer have a huge amount of use for it — I still have an epic, four-consecutive-weekend death march ahead of me, but all the ticket-buying is done. But I imagine this might be useful for travel in the future. Assuming that I survive.