With the instruction manuals I have made, Dropbox is the most interesting. I have one for me that I use in transferring documents. It is also easy to install and the steps are easy to understand.
Who would not want a storage that can be accessed anywhere? It will not be a problem anymore updating a file, and sharing them with others. It gets me excited knowing that I can have back up now for my pictures and other files.
So, here it is, feel free to browse.