I'm making a new post to report another observation that I found today:

After shutting down Media Player the FM Transmitter remains open for about 40 seconds, I suppose so you can change media players if you want. During this 40 second period the N900 transmits a "beep" every 2 seconds or so that is picked up by your receiver.

This may have been their before, but I never heard it without FM Boost invoked.

BTW, mine is a post-sales. Global DDP unit that I re-flashed to US regional firmware before updating to PR1.1
As reported earlier, I do need FM Boost... unless I've been drinking Kool-aid out of the wrong glass.