If your thinking about trying Linux out I first suggest doing this questionnaire. http://www.zegeniestudios.net/ldc/index.php?firsttime=true It will tell you the versions of Linux that are best suited for you and why they are the best for you. Second I suggest using the links it provides to download the LiveCDs of each of the suggested distributions (versions of Linux) so you can try Linux out without having to install it on your machine first (that way if you don't like Linux you don't have to go through the trouble of uninstalling it).
One of the best features about Linux is that it is customizable. This means you can make almost any distribution of Linux look just like any version of Windows. I think that if your very familiar with Windows you would enjoy KDE over Gnome as your desktop manager. Most people that I introduce Linux to that are familiar to Windows and never change the default settings tend to like KDE over Gnome.
Here are a list of things that you should try once you have selected a Linux distribution:
* Open up the internet and check your e-mail
* Write a letter and save it in a Microsoft Office .doc format
* Find the letter you just wrote on the hard drive.
* Save a picture form the internet
* Open that picture up and modify it
* Plugin your MP3 player and download a song
* Play the song
* Try to change the look of the desktop to something you like
* Check out a -look.org site ( http://www.gnome-look.org/ or http://www.kde-look.org/ ), download a theme pack, install it
* Install a new program with the package manager
* Remove a program with the package manager
* Add a screenlet/widget/gadget/whatever to your desktop
* Make sure that all your hardware is working properly and if it isn't try to install the Linux drivers for your hardware
* Find the online documentation and help desk/forum for the distribution
For the more advanced people out there:
* Remote into another computer
* Transfer a file from another computer through a secure connection
* Install a Windows program
* Install a program that isn't in the package manager (bonus if you can install the program from the source code)