BMW: 318i 91 - radom 3 beeps while driving, 3 beeps, audio equiptment

Question
While driving, at no particular time, but mostly within the first
10 minutes of starting the car, the car will sometimes beep.  It
doesn't happen all the time, but it's happening more often now.  
(It started with about once every couple of months, and then the
past 3 weeks it's done it about 4 or 5 times.)
It will sound 3 longish beeps.  No lights come on (or are on) on
the dash, and so I've no idea what it is.

Would you have any idea what this could be?

Answer
It is the memo option on your onboard computer. At least thats what it sounds like. You should have a memo button that you can push to toggle the option between on and off.

If that doest do it, then I would suspect an after market CD player or some kind of audio equiptment doing it.

hope this helps, manu