Between the upcoming media event on October 4 and recent downtime on MobileMe, it's looking likely that iCloud's public launch is coming soon. An email sent to an AppleInsider reader, reprinted below, adds yet more evidence for an imminent debut of iCloud.
Welcome to iCloud. The Apple ID for your iCloud account is [redacted] and it's what you'll use to get your iPhone, iPad, iPod touch, Mac, and PC set up. Just follow these instructions and you'll be up and running in no time.
Once iCloud is set up, it stores your content and wirelessly pushes it to all your devices. For example, buy a song with iTunes on your computer, and it will appear on your iPod touch and iPad. When you snap a photo on your iPhone it will automatically be sent to your iPad. You can start creating a Pages document on your iPhone, and put the finishing touches on it from your iPad. There's no need to dock or sync to your computer. With iCloud, it just works.
AppleInsider obviously feels the email is legitimate, though it was apparently leaked early since the setup instructions page is not yet live on Apple's site.
iCloud replaces Apple's existing MobileMe services and is free to all users. Apple has given no firm release date for the service other than "fall," but according to feedback we've heard from developers the service appears ready for launch should Apple decide to publicly debut it at the October 4 event.