Kirk McElhearnSenior Contributor, Macworld

Senior contributor Kirk McElhearn (@mcelhearn) writes The Ask the iTunes Guy column and writes about Macs, music and more on his blog Kirkville. He's also the author of Take Control of iTunes 11: The FAQ.

Shrink Preview files without ruining image quality

You may know that you can reduce the size of PDFs and JPG files by exporting them in Preview and applying a Quartz filter. But you probably don't know that you can customize those filters to improve image quality while still making smaller files.

Ask the iTunes Guy: iTunes tips 101

The iTunes Guy answers questions about importing and converting audio.

Find out what's keeping your Mac awake

Sometimes selecting Sleep from the Apple menu doesn't do anything. In that case, there's a Terminal command that'll tell you which processes are keeping your Mac awake.

Three apps for listening to streaming radio on your iOS device

Internet radio stations are easy to access via iTunes, but no so on iOS devices. These apps might be just what you're looking for.

Adjust file data and labels with A Better Finder Attributes 5

Use A Better Finder Attributes to change certain Finder attributes on specific files, like the creation or modification dates.

Quick Look in Messages, renaming Safari bookmarks

Two quick tips for Mountain Lion, one for previewing graphics in the new Messages app, the other for quickly renaming bookmarks in Safari.

Ask the iTunes Guy: Converting music files

The iTunes Guy answers questions about importing and converting audio.

Encrypt any disk in Mountain Lion

One of the more interesting (and less visible) new features in Mountain Lion is the ability to encrypt almost any disk, even simple USB flash drives. Here's how to access this hidden option.

How to save search URLs in Safari 6

The version of Safari that comes with OS X Mountain Lion has a new unified search-address field. That can be a big convenience, but it can also be a problem if you want to copy or save the URL of a Google search; the URL doesn't appear in the search-address field, only the search term. But Dan Frakes and others figured out some fixes for that.

Mountain Lion: Pause notifications, edit bookmarks

Now that Mountain Lion is here, it's time to roll out some reader tips for it. First up: how to quickly pause alerts and banners, and a shortcut for renaming Safari bookmarks.

Ask the iTunes Guy: Grab bag

The iTunes Guy answers questions on a variety of topics.

Use VisualDiffer to compare the contents of folders and files

With files, you may want to look at changes in source code, HTML code, or other data. VisualDiffer will spot these differences for you.

Force iOS to use YouTube site instead of app

The YouTube app that comes with iOS might be convenient, but it hasn't been updated in years. YouTube's own mobile site is better. Here's how to force iOS to use that site instead of the app for YouTube links.

Log Leech offers a clean interface for viewing system log files

Log Leech can group system log entries by application or process, something you can only do in your Mac's native Console by running searches.

Ten stellar keyboard shortcuts

Keyboard shortcuts can help you save time and keep your hands on my keyboard. Here are 10 of Kirk McElhearn's favorite shortcuts for the applications he uses most.