Here's the iCloud login screen. The metallic box with iCloud logo is very typically Apple.
The homescreen of iCloud presents us with five options - Mail, Contacts, Calendar, Find my iPhone and iWork
The contacts app is very similar to the redesigned Address Book on Mac OSX Lion and Contacts on the iPad.
Even the iCloud Calendar app shows major iOS influence. It looks very similar to its iOS cousin.
A web-based version of Keynote is also available through iCloud. Keynote is basically Apple's version of Powerpoint. It can also handle .PPT files.
Pages too makes an appearance on iCloud. Through iCloud, we will now have access to Apple's premier word processing program.