There are a few options on the market for wireless triggers. I opted for the Cactus V2s system. See my earlier post about this decision. They are also known as the ebay triggers and instead of Pocket Wizards the "Poverty Wizards".
There are a couple of problems with the V2s system. 1. the system can be unreliable and B. the range of the trigger is not very good.
I decided to modify my system as some other people have done. I have included some links so you can see what other people have done.
The Motley Pixel - This is the modification I attempted
I had some trouble making the modification but more on that later.