Here is a useful tool that could really help plan, test and record your lighting setups. The Online Lighting Diagram Creator (OLDC) provides a simple interface in which you can relatively quick put together a plan view of a lighting setup that you have used or want to try.
This would be great for photographers wanting to help their assistants to understand what they want and for assistants to record lighting setups that they have used and want to use again.
The interface provides lots of options and items for you to place around the work area. There is a good selection of lights and modifiers available for the smaller setups. However there is a glaring lack of tungsand some of the more modern flash kits, including Breise, are missing.
In general though this is a nice, free tool that could easily help photographers and assistants alike.