Use the File name box in conjunction with the Automatic and Long File Naming options to have Revit prefix all your exported drawings with the project name or number. You could add the project name and/or number in the name of the Revit views themselves, but that makes the view names longer and harder to read in the Project Browser.
Make sure the Save as type box is set to the version the AutoCADers like.
Definitely check the Export each view or sheet as a single file if you don't want Revit to make those goofy xrefs in your sheet files.
Now the real important step is to click that Options button and make sure the dialog box looks like this:
"All properties BYLAYER, no overrides" is very important for those getting your AutoCAD files, especially if you have links to other Revit project files. But this setting is not the default. This option makes sure all entities are BYLAYER so those downstream from you can override your colors, lineweights, etc. Many use colors in AutoCAD to control gray-scaling and need all your entity colors to be BYLAYER.
At the bottom, check "Export rooms and areas as polylines". This could be very helpful for those poor people still using outdated technology to count up room square footages across multiple CAD files. This setting is also required for many government projects.
The other setting you want to pay attention to is the Coordinate system basis. For Revit projects that are just 1 file without links to other Revit files, Project Internal may be fine. If your project is multiple Revit files all linked together using Shared Coordinates, you may want to set this to Shared Coordinates, but that's a whole other discussion.
Don't forget to click on the Layer Settings button to choose an appropriate layer export file that matches Revit entities with the correct AutoCAD layers. In the dialog box that pops up you will need to select the Load button and choose our RTKL export file which is:
V:\Revit_Architecture_2008\exportlayers-dwg-RTKL 06a.txt
Here's what those dialog boxes look like:
The bad news is that Revit may not remember your settings the next time you open it up and you will need to double check them every time you export.
