Apple has just released Mac OS X Leopard 10.5.7, and incremental update to their current desktop and laptop operating system (widely expected to be supplanted later this year by Mac OS X 10.6 Snow Leopard).
Why does this matter for iPhone users? When iPhone 3.0 Beta 4 arrived, note syncing -- which worked fine under Betas 1-3 and OS X Leopard 10.5.6 -- was suddenly gone, replaced with a statement saying simply that OS X Leopard 10.5.7 would be required for note syncing from then on. Beta 5 arrived with nothing but the same warning. Hopefully with 10.5.7 now available, note sync -- still something of a sore spot having taken 2 years to deliver -- will be restored.
Apple has also been known to sneak other iPhone friendly features, like Google syncing, into previous updates -- and not so friendly bugs into others that made Jailbreaking more difficult -- so we always keep our fingers just a tiny bit crossed.
Mac users, let us know if you find anything!