Sometimes applications can install extras in the form of System Preference panes. However, when you remove the app from your Mac, you might be left with extraneous System Preference panes.

To uninstall System Preference panes, just right-click (or control + click if you have a one button mouse) on the preference pane icon and select "remove x preference pane."

When you click "remove," the preference pane will be instantly moved to the OS X Trash can where you can completely remove it from your system by emptying the trash. Please note that this will only work on System Preference panes located in the "Other" section of System Preferences.

Want to see more tips and tricks like this? Visit TUAW's Mac 101 section today!

This time around in Mac 101 I thought it would be good to talk about uninstalling applications on the Mac, especially for the recent switchers out there. Unlike Windows, Mac OS X does not have a native utility for uninstalling applications. Most (though not all) applications are installed just by dragging and dropping them into the Applications folder, and most are similarly got rid of by dragging them to the trash. However, when you do that you often leave behind preference and support files, especially in your user Library folder hierarchy (/Users/yourname/Library, as distinct from /Library which is "owned" by Mac OS X).

While you can root these files out yourself, it's sometimes far from obvious where they are. To resolve this, a new class of uninstallers have appeared on the scene to address the problem. One of the first was AppZapper ($12.95), but many more have arisen like AppDelete (donations requested), SuperPop ($15), and CleanApp ($10). With most of these you choose the application you want deleted by dropping it on the uninstaller (or choosing it from a list); hit a button and the application plus its support files are sent to the trash. Taking a slightly different approach, Yank ($19.95) actually monitors your system while you are installing applications and creates a "Yank File" that records the location of everything created by the application. You then uninstall by running the Yank File.

Finally, there are uninstallers that integrate with the Trash itself, requiring no separate interface. Into this class fall Hazel ($21.95), which also does other automatic file management tasks, and AppTrap (donations requested). What's great about these last two is that you can just drag an application to the trash and they will automatically look for and offer to delete the support files. Indeed, this seems to me to be the most Mac-like and elegant approach. For my own part I mostly just use Hazel, though I still throw things at AppZapper now and again.

Everyone loves AppZapper for removing unwanted applications, and while many have called for something like it to be included in future versions of OS X, AppTrap comes closer to replicating the Mac simplicity we all enjoy so much. Expanding on the drag-and-drop workflow used to install programs, simply drag the unused application to the trash, and AppTrap pops up asking if you'd also like to delete any associated files.

AppTrap is free, open source, and installed as a system preference pane.

When it comes to uninstalling crap from OS X there is only one program that you should turn to (other than the Trash can) and that's AppZapper. Everyone's favorite application deletion software was just been updated to version 1.6.

New in version 1.6 are:

• Sparkle, for auto updating
• multi QuickZap™ which allows you to delete multiple things at once
• Better at deleting all files associated with an app

AppZapper costs $12.95, with a family license for $18.

AppZapper is one of my favorite utilities. As you can see from the screenshot at right, it's one of only two applications to earn the honor of a spot in my Finder windows' toolbar (ImageWell is the other). For the uninitiated, AppZapper lets you easily uninstall software. Just drop your target app's icon onto AppZapper and it searches your Mac for all related files. One click and they're all sent to the trash. Nice and easy.

Today, version 1.5 has been made available. Changes include:

• Several bug fixes
• Resized QuickZap icons
• Reworked window resizing

There's more, of course, including the coolest new feature, ZapGenie. This lets you sort your applications by the last time they were used. Quickly find and eliminate those apps you downloaded, tried once and then abandoned months ago! AppZapper requires Tiger and a one-time fee of $12.95US includes free upgrades for life.