Dropbox has added two-factor authentication in a pre-release version of its software. The two-factor method requires a password plus a token delivered via another means, such as SMS or a special code-generation iOS app. At Macworld, Dan Moren explains how to use the new option, which reduces the chance of third-party break-ins, as a password alone no longer provides access. But note that AgileBits is recommending that 1Password users who rely on Dropbox for syncing passwords hold off for now. follow link
Customize Open/Save Dialog Sidebars
You can customize the sidebar in an Open/Save dialog the same way you can in a Finder window: you can reorder the position of items, drag them off into puff-of-smoke oblivion, and even drag a folder from the dialog's list into the sidebar.
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Dropbox Two-Factor Login Explained by Macworld