eDrawings for SketchUp is a plugin for SketchUp, which allows one to publish .skp files as read only eDrawings files.
The most tangible advantage a publisher provides is that it makes the content read only.
In the same context, one might wish to selectively provide the end recipient of the published file with measurement capabilities. eDrawings for SketchUp provides you with a means to do the same. You also have a means to password protect your file for added security.
The size of the published file is also reduced as compared to the SketchUp Source file thereby enabling communication even via email.
One of the formats you can save out an eDrawings file as is as an exe. Here, the Viewer component is coupled with the file. This would enable the end recipient to view the file without any additional download overheads.