iCloud services and the website which were previously in beta, required a developer account in order for you to access it. Now that it has been publicly released you should be able to check the services out as long as you have the required OS.
iCloud builds on what was offered through the MobileMe and adds some much needed features. You can sync your contacts, calendars and email. You can also sync items you have purchased from the App Store and quickly access your purchases across your devices.
Want to check out iCloud ? Head over to www.icloud.com now
Additional features include Photo and Music syncing which allow you to access your photos and music across your devices.