Other options

Since we have had our lecture on fill flash for photojournalism a lot of students have started to look for ways to move their hot shoe flashes off camera. The "industry standard" are Pocket Wizards. This uses radio waves to send the signal to trigger you lights. But these empty out your wallets at the price of $169 each a you need two. But there are other options. First there are Radio Popper Jrx's. You can pick up these for $120 for the basic set for $140 for the studio set. The only difference is the studio set allows you to control your studio flashes from you camera(yea "the industry standard" won't let you do that!)Here is a review from Strobist.com

Next up is a set up triggers from Paul C. Bluff(aka Alien Bees) called the Cybersyncs. These also use radio waves to transmit their signal. These retail for $59.95 for the Transmitter and $69.95 for the reciever. You need both.