My MacBook keeps DINGING!

Guys/Gals:

My 13" 2009 model unibody MacBook Pro has developed a beep. Its not the moo out of the speakers that people have posted about, or the noise of the hard disk heads parking. This is a system beep - and makes a different noise if I change it in System Preferences.

Its only Safari that beeps, and sometimes does it every few minutes, but then other times it doesn't do it for ages. Three times its gone off in the last 5 minutes now and I have *NO* clue what its trying to notify me about.

I only have one tab open, the one I'm posting this in now.

I've looked at the Console (/Applications/Utilities/Console.app) to try to figure out what is causing it, but nothing obvious is in there or corresponds with the times of the beep.

How can I see why it is beeping??! I've tried restarting, but no avail.

Any advice would be greatly appreciated.

I'm on 10.6.4, Safari 5.0.2 - all the latest security fixes etc.

Thanks

pac

 

Attached is from activity monitor and my Login Items:

Yes I have Office 2008 installed, but I don't use Entourage

Any ideas?

Thanks

pac

 

Its not MSN - its only when Safari is open, and I've disabled TomTom Home Runner now (even quit the process)

Will see how I get on

pac