I am a huge fan of having access to my files anywhere, anytime. On a friend’s computer, at home, on my mobile device (the iPhone), etc. Securely, of course…
I have written about file storage and sync’ing before, a lot of them are freemium (you need to pay for extra storage, more features, etc.). A few I’ve found have unlimited storage, like MediaFire.
Also, having a neat little Webtop (desktop on the cloud) can be an interesting concept as well and it is evolving little by little.
Watch out for Tonido as well, especially for those scared of putting their files out there on a server controlled by other people, well, Tonido lets you easily share files from your computer with not need for uploads… basically unlimited storage (for as long as there is space on your hard drive)… not WebOS, but pretty close and might actually work better than “desktops on the cloud” for now.