Jarel Remick put together a whopper of a post on just about everything you could ever want to know about Dropbox ever. What sold me on Dropbox earlier this year was figuring out what a great tool it made for keeping real-time backups of your Documents folder. I have a Current Projects folder that sits on Dropbox, and that’s where I store all of my day-to-day files.
Also, by using Symlinks, I have the Application Support Folders for my most-used apps (MarsEdit, Yojimbo, 1Password, OmniFocus) sitting in Dropbox as well. Which means if didn’t backup my laptop a week or two, chances are good I would hardly lose anything important. And if I drop my laptop on the way home from work or while walking to the living room, I for sure won’t lose anything.