Great tips! only knew 2 outta 10!
my own addition to the fray is to use it as a minimal fuss subversion or cvs after i recently discovered that it keeps version history of my files! you can't really keep comments / meta info associated with versions though.
here's my favs from the list of ten
5. Host a Web Site or Start Page for Your BrowserSo you've built your first web site, and now you're looking for somewhere to host it. You can actually host it for free right in your Dropbox—either manually or with a service like DropPages. This trick is also handy for syncing your custom start page across your systems, so you have it everywhere you go—whether it's one you created yourself or one of the many we've featured here before.