I'm a full time Linux user and love it. I used to have a dual boot setup on my laptop with Windows but now only run SuSE 10.0 on it. If you are a gamer, Linux is not for you. There are games out for Linux but the newest and greatest are usually only available for Windows. Should you use your computer for anything else, Linux might be a good choice for you.
Since you don't run Linux as root, Administrator, a malicious program can only infect the files you have permission to, which excludes all essential operating system files.
All good Linux systems come with an EXCELLENT firewall out of the box.
I have been using Linux for almost 10 years now and have settled with SuSE, the included KDE desktop is great to work with, once you use it for a while you will find out where Microsoft is getting their ideas from.
Go give SuSE a try, OpenSuSE is free and should be everything you need.
http://en.opensuse.org/Welcome_to_openSUSE.org
I use Linux for:
Internet - Mozilla Navigator - mozilla.org
eMail - Thunderbird
Basic Webdesing - Mozilla Composer
Programming - Kate, Netbeans
Word processor,Spreadsheet - OpenOffice - openoffice.org
Digital Camera Fujifilm s5200 - No Drivers required it just works
Image Editing - Gimp - gimp.org
CD/DVD Burning - K3b
Bittorrent - Ktorrent
I also host my own domain names with websites and email server, no special "$700 Server Edition" required. I have full http,smtp,pop3 and ssh support.
All Programs are on the Operating System CDs
I fix Windows computers for a living, when I come home I want an Operating System that "just works".
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Skylinux
Network-Technologies.org