[Macka]

Here's an idea. Export your current database in OmniFocus document format to a file called "default". Open the default file and then delete all the projects from its library. Close the default file.

From now on, if you want to send a Project to a colleague, copy the "default" file to another file (say the name of the project) then open up the new empty Project file. Drag 'n drop the project you want to send onto the Library of the empty Project file. This will copy your Project into the new file. You now have a single OmniFocus file containing a single Project. You can email that you your colleague, who after opening it can drag 'n drop it into his own OmniFocus Library.

Should work a treat :)