If you have a mid-2010 iMac, Apple has just released the iMac Hard Drive Firmware Update 1.0 to resolve a problem that might prevent your iMac from booting properly. Although there’s no way to know if you really need this update or not, the inability to boot could make installing this update in the future significantly more difficult, so I’d recommend doing it now, after making sure you have a current backup. (Free, 767 KB)
Sleep (and Lock) Your Screen
When you are walking away from your computer, it's fairly common practice to start your screen saver and lock your screen. But did you know that there is a built-in keyboard shortcut in Mac OS X to sleep the screen?
Press Control-Shift-Eject and your monitor sleeps without engaging the screen saver.
iMac Hard Drive Firmware Update 1.0
better-looking. Edit your PDFs anywhere. Sign contracts, make
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Syncs via iCloud and Dropbox. <http://smle.us/tbpdfpen-ipad>