have you tried DropBox?

[eTiMaGo]

We use Dropbox for work and it's invaluable. I often work from home and can make a change to one file, that our staff at the office can then use just a few seconds later without having to worry about to email or copy and paste. It also rocks for posting pictures on a forum or otherwise, with the 'public' folder, you can simply right click and copy the URL to the file to your clipboard, to be pasted wherever you wish, without having to navigate slow online photo albums or manually upload changes to a file, etc...

So yeah, it just works extremely conveniently, although yes, certainly the space they give you is a bit tight, and their paid options (50GB for $10 a month) are a bit steep, but it just works.