Renaming project


How do I rename my project? Let’s say I’m starting a new writing project called “Untitled Writing Project 2010” and later, ie: after I’ve sold the idea or come up with a good title, I want to rename the project to this new title. How do I do this? I expected it to be on the File menu, but isn’t. I know I can do a ‘Save As’ and rename the project that way, but then I have to get rid of the other Untitled one manually.