Welcome back to Mac 101, our occasional series of tips for new and novice Mac users.

Over the past 25 years, icons may have become ubiquitous almost to the point of fading into the visual background; still, the little pictures that began in 32x32 black and white format have grown up quite nicely into the massive 512x512 icons we enjoy in Mac OS X 10.5 Leopard. Although the list and column views are more utilitarian for most file management tasks, there are times when icon view is the way to go.

You can control whether or not a particular Finder window displays in Icon view via the View Menu ("as Icons," or ⌘-1), and then adjust the display size of the icons via the View Options inspector panel (⌘-J). You can get up to 128px square icons in Finder windows, which is plenty big, but what if you want to see all the graphical power of those fully operational battle icons?

One way to see the full-size icons is via Cover Flow -- simply switch your Finder window to "as Cover Flow" (via the toolbar button, the View menu, or with a quick ⌘-4) and you can scale your icons at will by adjusting the window size. If you prefer not to have that black background around your icon, however, what is there to do? Thanks to Rob Griffiths at Macworld & MacOSXHints, here's a great tip for getting the maximum size out of your icon previews in the Finder without resorting to Cover Flow.

To view icon previews up to 512x512, hit the Spotlight search field at the top right of the window; search for a null string (two quotation marks next to each other, no space in between, like so ""), then change the search target from This Mac to Current Folder and the search type from Contents to File Name. Switch to icon view and you'll see, at the bottom right corner of the window, a scaling slider. Push it to the right to maximize your icon size. It's just the thing for appreciating the fine detail on your bottle of unicorn tears. (If you're looking for the CHOCK LOCK and Rick Astley icons above, they're in the QuickPix 2008 pack from the Iconfactory.)

Rob also hazarded a guess that we might see a more accessible version of this feature in future Mac OS X versions. If you watched the Snow Leopard stealth preview video posted earlier, you know he may well be right.

A while ago, Derek Powazek proposed an idea for a mini Mail window based on the functionality of iTunes' mini option; hit the best fit button - the green one - in iTunes to get an idea, or simply check out Derek's post for an actual screenshot mockup of the concept. Fortunately, John Gruber just caught that OliveToast software literally ran with the concept, releasing - to my absolute delight - a MiniMail plug-in for Apple Mail.

As you can see, MiniMail allows users to simply hit Mail's best fit button (or choosing Window > Zoom) to condense it to a 'just what you need' view, offering a customizable preview area and three menu buttons for performing a healthy set of operations. Fortunately, keyboard shortcuts still work fine as well, so ?-n will create a new message. Even using the arrow keys works for moving back and forth in the message list, and thankfully, the list of mailboxes is customizable for this view as well so you can see just what you need.

After a few minutes of tinkering with the demo while writing this post, I'm happy to say that the receipt for my $9 license just arrived. MiniMail rocks, and I'm so glad someone brought Powazek's concept to life, as this is the perfect compromise that I've been looking for between constantly hiding and showing Mail while still making it easy to do basic things in it on the fly. Thanks, OliveToast software.

One of the things that has been bugging me since updating to iTunes 7 is the inability to see all my content at once; podcasts, video, audio and PDFs-all of it. While I normally don't need to see all my content in a single view, certain tasks, such as when I'm trying to get a feel for how much media I have on my machine, can't be completed without this ability. Luckily for me, macosxhints has posted a stupidly-easy workaround for this conundrum by way of a custom smart playlist. All you have to do is create a smart playlist with the condition set to show all media greater than 0 megabytes, and sha-zam! You've got that olde-timey functionality alive and kickin'.

For those of you longing for the often-requested three-pane view in Mail.app, Tim Gaden at Hawk Wings has dug up yet another stellar find: an actual working version.

This Ars Technica forum thread begins with the typical "gee, it'd be great if..." post which oh-so-often yields productive results such as the screenshot you see in this post: a hacked version of Mail.app with a three pane view. Fortunately, this hacked version of Mail.app has a different name (MailWidescreen) so you don't have to bite your nails over whether to overwrite your original Mail.app. Still, it would be good practice to back it up anyway for good measure.

Personally, I think the three pane view in email apps is one of those needless 'change for the sake of change' developments that seems to have oozed out of an admittedly old email UI industry. Email subjects can be pretty useful and revealing, while most emails are never long enough to warrant all the space a three pane view gives to the message, and this view seems to enhance both of these complications: subjects are cut short, while white space is wasted on typically short emails. Just note Exhibit A - this post's screenshot.

With my $0.02 out of the way, however, check out the forum thread for details on this hack's development, or simply use the direct link to the .ZIP file right here.

Today's tip is a quick one about iCal, and it hails from the ever-useful archives of MacOSXHints. iCal's preferences allow you to choose how many hours you see in a day or week, but you can easily and quickly change this setting with a simple shortcut key. If you have a scrollwheel mouse or a two finger scrolling trackpad, simply hold the option key and scroll up and down in iCal to increase and decrease the amount of hours you can view.