Tweak a file on your Mac; it will be available and updated seamlessly on your iPad. You’ll note that—save one pie-in-the-sky wish for system-wide audio transcription—iCloud as described Steve Jobs Monday satisfies . It’s invisible, available to third-party developers, and means never needing to drag a blasted file into the iTunes File Sharing box again. And it keeps your contacts and calendars in sync, too.

iCloud also makes device syncing a lot better. Download an app on your Mac, and it’s automatically installed in your iOS devices. And while iOS 5’s cord-cutting isn’t quite an iCloud feature, it’s similarly wonderful: Syncing your iOS device without needing to plug it into your Mac is unquestionably an excellent upgrade.

Because of what it means for sync, I love iCloud even before we get to .

A while back, I offered up a , and many of them should make an appearance in iOS 5.