Icloud usage?

I recently bought a macbook that came with Icloud. My wife has an Iphone and would like to be able to store her pics and videos via Icloud. She has a different Apple ID for her Iphone than I do for the Macbook. When registering Icloud, can I have multiple users for it? How do I go about letting her register her Iphone while being able to use my own Apple ID if I buy an Ipad down the road?
Thanks

You can use multiple iCloud accounts on your Mac with caveats, see link for details
iCloud: Features that work with one account at a time on iOS 5 and OS X

Nice! thanks for the link!