Dropbox for everyone

I've been using Dropbox for a while, and it's one of my favorite utilities. Aside from allowing me to synchronize project file between home, work, and my iPhone, it also lets me share files with my family (also Dropbox users), and large files with anyone. It even creates instant online photo galleries by putting photos in a local folder.

It's cross-platform compatible, has lots of features, and best of all, it's free!