Dropbox was big pioneer, but it is lagging behind, for example they give only 2GB free. I just tried copy.com and it is as smooth as dropbox, but with 15Gb free space. Pretty decent. Just heads up if anybody was looking for more space and did not hear about it.
ps: I can not imagine how to use that much, but for guys who uploads videos that may be possible.
They even give you extra 5GB if you go via reff code (
https://copy.com?r=wA83yB).
Plus they do not cut space on shared files. If you share 2Gb with 4 people every of them lose 500Mb. With dropbox all of them would lose 2Gb.