Switcher's FAQ:

How do I right-click?
Click and hold the mouse button down or press the control key when you click.

See also iPirate's list of Keyboard shortcuts.

See also I've just switched to Mac, what's the best program to...

What's the best way to learn about Mac OS X for new user?
Find Out How from Apple. This is a very useful resource for switchers.

How do I network between my Mac and my PC? (Leopard and Vista)

How do I move my iTunes library from my PC to my Mac?

How do I make backups?
A: Use a second (external if necessary) hard disk and select it as a Time Machine disk in the System Preferences. When you first plug it in, the system will ask you anyway if you want to use it for Time Machine. Dedicating the entire drive to Time Machine is the best option. See the Time Machine article for more info.

What brand RAM should I get for my Mac?
The most common recommendation is Kingston RAM. It's available very cheaply from just about anywhere and has an excellent reputation. 2Gb sticks are very cheap at the moment, with 1Gb costing extremely little. 3 or 4Gb will make for an excellent machine, especially if you start going photo or video crazy. Apple's iMacs, as well as their notebooks, take notebook DDR2 RAM. A simple option is to use StaticIce to find the best price.

How to transfer/Import Windows Thunderbird Mail and Outlook Express into Apple Mail

Is the AppleCare Protection Plan (APP) worth it?
Yes!

What's the best program for MSN, Yahoo, AIM, Jabber or ICQ?
iChat will do Jabber, ICQ and AIM. Adium is the most common client for all IM systems, however.
How to use MSN with iChat (by using a Jabber gateway).
Chax is recommended for use with iChat as it adds extra features and improves ICQ support.

Can I video chat using MSN or Yahoo on a Mac?
There isn't full support for audio using the MS or Yahoo clients. Skype is a better and more reliable option for that. There are also iChat-to-MSN transports. Only limited video/audio chat ability is available from the official MS and Yahoo programs. Skype is recommended if you wish to video chat with friends, followed by iChat (which uses AIM, Jabber or .Mac).

Can I run Windows apps on my Mac?
Yes. You have a few choices, Apple's Bootcamp, that allows you to dual-boot the machine in either Mac OS X or Windows, or a "Virtual Machine" of which Parallels and VMWare Fusion are the most popular and usable. There's now a virtual machine solution available from Sun called VirtualBox. While not as functional as the others, it's free!

You can also try Crossover Mac, based on DarWine, a Win32 API layer that allows some Windows applications to run natively, such as MS Office.

How do I remove Applications in Mac OS X?
Usually drag them to the trash. If you want to completely remove all traces of an application, there are a couple of programs, such as AppZapper that will search for all the files (such as preferences) that an application has left around your computer.

What Anti-virus program should I use in Mac OS X?
None unless your work requires it. There is, to date, one virus and one trojan for Mac OS X. The former requires that you manually install a fake video codec from a porn site. If you are required for your work to have an AV program, ClamXAV is recommended. Avoid Norton anything unless you want your machine to run at half speed.

How to transfer/import Windows Firefox Profile to Mac OS X Firefox

How do I control which application opens what file?
Click once on the file and select "Get Info" from the File menu. Choose the application from the "Open with" menu and then click on "Change all". To manage these settings more comprehensively, download RCDefaultApp.

How do I play this video file?
Installing Perian will allow the playback of most types of video. Installing Flip4Mac will allow the playback of files up to WMP9. WMP10 files are not playable due to the incorporated DRM. You can also try playing the file in VLC.

External Backup drive for PC and Mac

How do I hide files and folders in the Finder?
How do I password protect folders in the Finder?

How do I take screenshots?
Command-shift-3 for the whole screen. Command-shift-4 to select with the mouse an area to capture. Command-shift-4 then press the spacebar then click on a window to capture. Also, you can use Skitch for easier snapping and sharing of screenshots.

What webcams can I use with Mac OS X?
I need a Mac compatible webcam
Excellent Mac webcam option - the XBox 360 webcam

How do I change the spelling dictionary in Mac OS X to Australian English?

I saw this before but I am going to need it when I get a MBP. Thanks mate

My "I've just switched to Mac, what's the best program to..." thread.

I'd update it, but I can't any more for some reason.

that is a very helpful thread!

i'd add skitch to that, cos it makes posting to the forums dead easy.

Discovered Skitch today... I bloody love it

It should be noted Currawong, that using ICQ with iChat will require something like Chax to work correctly.

Great stuff. Just the information I need for for my soon to arrive Mac Pro.

Thanks Currawong

Would it also be recommended to link to the MSN through Jabber article?

Just for the curious.

A mention of osx.iusethis.com would also be good.

As well as FTP programs, free alternatives to MS Office/iWork, good Apple tutorials(there was a thread here somewhere), etc, etc.

Certainly bennyling...want to provide the link?

I've added the other suggestions to my post, by the way.

Great collection there Currawong

actually, what about Quicksilver?

the bestest app ever..

ftc, I'm focussing on things that get asked often by people switching rather than what apps are best.

but all switchers should learn quicksilver!

in should be part of osX

Here's the link for the MSN through iChat using Jabber article:

How to: MSN through iChat!

Kudos goes to andrew.wilson.