The box deadlift is a great training tool for many reasons. One, it allows for a greater time that you pull; obviously the ROM is greater so you are forced to pull for a longer period of time. I think this also helps your grip - you are forced to hang onto the bar for a longer period of time. Two, this seems to help people that have weak lower backs and a weak start in the deadlift. And finally, it adds some much needed variety into your training.
To set this up, all you need is a box that allows you increase the ROM without smashing your toes. The one pictured is about 4" high.