Here are some tips switchers may find useful. Feel free to add your own.
Go through System Preferences so that you get accustomed to the Mac's settings. This includes:
- playing with the Dock, Expose and Spaces;
- going into Security and Sharing settings;
- updating your Mac with Software Update;
- choosing what not to update with Time Machine;
- making sure Date and Time is set to your region;
- selecting your.Mac options (if you've subscribed to .Mac);
- going into Accounts and setting up a new user as a admin user and then changing your own user account to Standard.
There are two main ways to install apps (the drag to the Applications folder method and the installation wizard method). To delete the former it is usually only necessary to drag the app from the Applications folder to the Trash but for the latter, running an uninstaller is usually needed unless you want things to get messy and remove lots of apps by hand. Of course, there are other uninstaller apps such as AppZapper, AppTrap, etc which will remove the .plist and other related files - switchers like these as it is close to using the Add/Remove function for Windows apps.
For the new user, as they probably won't know what they will use most, their Dock will probably contain the apps that come from Apple: e.g. Mail, Safari, iCal and the iLife (and maybe iWork) suite of apps. As the user gets to use other apps, they can drag them to the Dock for easy access. Icons such as the Apple @ icon on the Dock can be removed unless you really make use of it.
If using iWork and wanting to save as Excel or PowerPoint or Word format, you need to choose File>Export (not Save) - a question I've been asked more than once!
You can save documents as .pdfs via the File>Print option (or File>Export in iWork apps). No need for third party apps such as Adobe Acrobat.
Get an external hard drive so you can make clone back-ups with an app such as Carbon Copy Cloner or incremental back-ups with an app such as Time Machine.
Switchers and new users can get lots of handy tips by simply going to the Help section of the Mac's Menu Bar or Apple's 101 webpages:
Apple - Support - Switch 101 and
Apple - Support - Mac 101