You mean articles at anandtech?
Probably because anandtech doesn't do much in the way of operating system reviews. I expect that the main reason that they had linux articles anyways was because they figured readers wanted to see what the benifits were for 64bit computing and Windows hadn't released a stable operating system for it at the time.
But don't worry about Linux on a larger context.
For example:
Linux in embedded programming is having a upswing. Phones, media players, machine controllers, robots, etc etc. It's currently the 2nd most popular OS to use in that arena. Windows embedded versions are a distant 3rd place.
There was recently a new Top500 list release that had the top 500 most powerfull supercomputers in the world. 75% of them run Linux, including those BlueGene systems, which are the top ranking currently.
In the enterprise server arena, a area previously dominated by big-iron Unix machines and mainframes, Linux is enjoying a nice upswing. Quarter on quarter double digit growth for who knows how long. Expected 22% growth this year alone, in revenue. So that is people actually going out and buying Linux servers as opposed to building it themselves (which aren't being counted, it's not so much actual numbers of servers, but actual revenue from sales).
http://news.com.com/IDC+Linux+server+sa...llion+in+2008/2100-1010_3-5479681.html So Linux on the server is a 9.1billion dollar business.
etc etc etc.
Of course Linux-on-the-desktop is still lagging. Having lots of games would help a lot, but it's a bit of a chicken and the egg issue. Linux on the desktop for the home user isn't going to get popular unless it gets easy support for lots of games. But game makers aren't going to support Linux unless it gets popular first.
Catch 22.
So Linux gaming is a bit screwed in that respect. The idea that Linux companies have right now is to focus on business desktop and if they start getting good headway in that market then people will want to have Linux at home because it'll be easier to do their work without having to go to the office. Once people want to have Linux installed then they are going to want to have games to play on it. Once they start demanding then game makers will start making.
But in the meantime if your interested in gaming on linux news check out:
http://www.happypenguin.org/
http://www.linuxgames.com/
http://www.linux-gamers.net/