One of the things that confused me the most when I switched to the Mac platform was the fact that there's no built-in way to lock the computer manually with a hotkey when walking away from it. This is something that was drilled into me from working in an office full of pranksters where leaving your computer unlocked was virtually a guarantee that you would be hosting a party for all of your co-workers that coming weekend.

It turns out that this is an oversight in Mac OS X, and a 3rd party utility is required to be able to lock your computer with a hotkey. For a simple solution I would suggest installing a very basic preferences pane called LockTight.

LockTight does exactly what you're looking for: assign a specific hotkey that when pressed will lock your Mac, requiring a password to unlock it if you have it configured to require a password to wake from sleep or screen saver (which you should).

Update: Reader Chad reminds us that if you actually want your machine to go to sleep with a keystroke (as opposed to simply locking the screen) you can use the Option-Cmd-Eject key combo.

[via Lifehacker]

Controlling your music while you're working (or playing) on your computer should be virtually seamless. While these days it's almost impossible to buy a keyboard without media keys built-in, there are many users that either don't have media controlling keys on their keyboards, or would simply prefer to keep their hands on the actual keys. While iTunes is not capable of assigning hotkeys on its own, there are a number of iTunes controller applications on the market that can add this functionality.

In my opinion SizzlingKeys deserves to be at the top of the list of iTunes controller apps for its simplicity, reliability, and extra features. SizzlingKeys installs as a preferences pane, and has a very intuitive interface that allows you to choose which functions to enable, and what the hotkeys should be for those functions.

The list of things you can control with hotkeys is fairly comprehensive:

• Play / Pause
• Previous / Next Track
• Volume Down / Up
• Mute / Almost Mute
• Show / Hide iTunes, Playlists, Search
• Set song rating
• Show floater (song information)

In addition SizzlingKeys offers some non-iTunes "extras" that you can control:

• Sleep computer
• Lock computer
• Activate screen saver

The standard version of SizzlingKeys is free, but there is also a Pro version for $5 that includes the ability to skip forwards and back by a customized interval, the ability to toggle shuffle and repeat modes, and the ability to control the system volume.