Worst default setting. Ever.
iTunes has just wiped out over 3 years of collected music on my iPod. By default it attempts to sync the iTunes database on the computer with that on the iPod. I just installed an iTunes update today (cos it was listed in the Software Updates on my MacBook) and it reverted the setting that I had previously changed, telling it *not* to do this.
A lot of this music I'll not be able to replace. Very disappointed with Apple's choice of default setting.