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To move a project out of OmniFocus, drag a copy of your OmniFocus.ofocus file from ~/Library/Application Support/OmniFocus/*to somewhere else (like the Desktop). Make sure you copy the file; don't move it.

Rename it so you don't confuse it with your original file, then double-click it to open it. Delete everything but the project you want to send to a colleague. Close the file, which now contains only that project. (You can also use this method to create an empty OmniFocus file for future use, eliminating the need to repeat these steps.)

You can now send the file (really, a package) to your colleague, who can double-click it to open it and then copy or drag the project into his or her OmniFocus file. Depending on how your email program handles packages, you might want to turn it into a ZIP archive first.

I'm not sure what happens if you have contexts in the project that are not in your colleague's file.