Victoria Barret of Forbes has written a charming piece about the rise of Dropbox, the cloud-based file sharing site that we and numerous others have come to rely on. Especially interesting is her telling of the meeting the Dropbox founders had with Steve Jobs, and their concern about what iCloud may become. (For the moment, they have little to worry about, since iCloud is for individuals syncing their own devices, whereas Dropbox also enables multiple people to collaborate seamlessly.) follow link
Go Back and Forth Fast in Preview
If you're reading a PDF in Apple's Preview software, and you follow a bookmark or an internal link to move around within the PDF, you can quickly return to where you were by pressing the keyboard shortcut Command-[ (that's Command-Left Bracket). Or, you can choose Go > Back.
The command works iteratively, so you can go back to just the previously viewed page or if you issue the command again, to the page before that, and so on. There's also an equivalent Go > Forward (Command-]).
The Inside Story of Dropbox