This is a wee warning to those of you who might be tempted to upgrade to iTunes 5.
Don't do it!!!
I've spent the weekend wondering what the f**k has happened to my network as this piece of software has seen fit to play around with the DNS settings so you can only visit sites that you know the IP address for.
So if you start up ITunes and get the wee box inviting you to upgrade DON'T
Alan