This post has been migrated and imported into different systems over the years, I have not had a chance to format this post manually so it may be hard to read but I have left it here as a reference.
I have been using dropbox for over 2 years now and it is an awesome tool which has saved me countless of times when I needed a file or document. Currently I have about 15 GB of files synced between all my computers all the time and if I am ever without a computer I can always access the dropbox website from any computer and download the needed files. For extra security I have also added my phone number to my dropbox account in case my password ever gets compromised. I also have the dropbox app for both my iPhone and iPad which syncs any ebooks I have directly to my device where I can then move the ebook to my iBooks app without the need to plug it in and sync it with my computer through itunes. Dropbox is free and you start your account by clicking here or start a 2 Week Free Trial of Dropbox for Teams