I've received a couple quesitons about what I use to trigger my strobes (when I actually use them, of course) - the short answer is RadioPopper JrX's. The long, and more detailed, answer is RadioPopper JrX's with customized/hacked RPCubes (I'll come back to the modification). Basically, the JrX series of RadioPoppers allows you to control the power of your off-camera flashes in groups via knobs on your transmitter, which sits firmly above the eyepiece on your camera. Most radio-triggers simply send a 'fire' signal, the receiver picks that up, fires the flash, and that's the end of it. JrX's send a 'fire' and a 'quench/stop' signal - which happen to be correlated to the manual flash power levels we've become accustomed to. This means you don't have to walk to your flashes to adjust power levels, it can all be done behind the camera. Before I go on about the necessary modifications that need to be done, I should let you know that other systems out there that can do radio-controlled TTL, but not at this price-point, with this high of reliability, nor with physical knobs.
My one gripe is that you actually have to make some mods to the setup to use the product as I'm explaining. Why? Well, I shoot Nikon and RadioPopper hasn't released a hotshoe that can receive the 'fire' and 'quench/stop' signals. Sort of an oversight if you ask me, but making one isn't complicated, so I won't complain too much. I learned how to do this nifty trick by scanning the strobist Flickr forum on this topic. Instead of making you read the entire thing, here's the link you want, and below explains it all in a photo.
What you need is a Nikon AS-E900 TTL Hotshoe adapter, a stereo headphone jack, and some electrical tape - no soldering required. Just cut them both open, make the necessary connections, and test it out. If you accidentally reversed the left/right channels, nothing bad will happen. In fact, nothing will happen, that's how you know it's backwards. After it's all set, cover it up with electrical tape. All done. Tip: make a bunch of these. They are cheap to make and you never know when you'll be expanding your collection of flashes.
So like I said, the field of radio-triggers with TTL functionality is not ruled by these things - they are the ones that will give you the best bang for the buck (in my opinion).
Check out RadioPopper JrX's here.