There is a new competitor to Dropbox that so far seems to work the same way. Except the start at 15 gigs of space, and if you use my link, we both get 5 more gigs.
https://copy.com?r=Jqj7S3
This sounds great to me, my 4.5 gigs on Dropbox is always full because I have all my Construct2 projects in there.
No, it's not totally spam, we all use Dropbox around here, this applies.
Edit: Update: As of Oct 2016, Copy went out of business and Cubby is too. I believe I was up to 125 gigs of free space before it shut down. Sigh.