Lots of options, but I find
Dropbox to be the best. They give you 2GB for free, but if you sign up with someone's referral link (
here's mine), you get an extra 250 MB! There's also lots of
other free ways for you to expand your storage once you create an account and install the desktop software. I'm up to 4.88GB of storage without ever having paid a cent.
Box.com is another decent site; creating an account there gives you 5GB of space, but they also run lots of promotions that can net you a 50GB account for free. For example, last month any account that was activated by a device running iOS (thank you, girlfriend's mom's iPad) was automatically given 50GB for life. The only drawback to Box.com is that you can only upload files under 25MB, which means no movies.
Keep in mind also that you might not even need cloud storage - there are lots of apps that will let you access your computer right from your phone! Phandroid isolated the apk for Motorola's ZumoCast app and posted it , available for download and installation on any Android phone!
Stream All Your Media From Your Computer To Your Device With Zumocast [Download] | Phandroid