Today Apple launched a beta site for iCloud.com where developers can test the new web features. The new features include Calendar improvements, the addition of notes and reminders, and improvements to the Find my iPhone application. To be able to get in you must have an iOS iCloud account running on iOS 6 beta or I believe an iCloud account running on OS X Mountain Lion. If you have an iCloud account with those then head to beta.icloud.com and sign in!
uApps 