Five Good Reasons to use Linux -or- Why OS X is a "Gateway System" for Many Users By Thad Guy
1.Easy program installs
Because much of the software for Linux is open source and free, it can be distributed by pretty much anyone. This has allowed for the development of central storage locations for Linux software. With these central locations have come programs that can quickly retrieve software from them.
Things have gotten to the point now that through a very simple program one can download and install a multitude of programs with a single click of the mouse and an administrative password. This also works in reverse and makes it very easy to uninstall unneeded programs.
In my view, this is the killer feature of Linux distributions like Ubuntu.
2.Automatic updates
Sure, updates to the operating system is a common feature for almost all operating systems. This is not a unique feature of Linux. However, with Linux and it's freely distributed software all the open source software on your computer can be updated very very easily. When a new version of your word processor, music player, e-mail client, or web browser is available one little program can update them all with a single click.
This allows security holes to be sealed that much faster and, as far as the Linux community is concerned, would probably seriously impede the spread of a virus (which is not really an issue at the moment because almost no one is trying to write viruses for the Linux desktop user).