The last time I attempted to run this game with SoftTH it didn’t display as planned.
After a bit of reading I found Widescreen Fixer that fixes the field of view (FOV) of the game to suit the resolution being used in this case 5040×1050.
I used SoftTH 1.09a which worked a treat, grab my config file here remember to modify to your desired resolution, and change the extension to “.cfg”.

Here’s the video of the game in action played on regular on the first level since it was the easiest to fit into the 10 min limit on Youtube, eye candy was set to high with x2 AA.
Surprisingly Call of Duty scales very well.

So I finally bothered to put my far left monitor to its horizontal position to give Left 4 Dead 2 a spin in triple screen mode.
I used the same settings I used in my previous experiment with the original Left 4 Dead.
I’ve noticed that the game does not keep the screen size settings when you close it so you must set the resolution and screen mode to “Fullscreen” each time.

This is either because the game isn’t writing the config or I did something wrong but it seems to work okay, I don’t guarantee that my settings will work 100% with your own setups so a bit of tweaking on your part might be necessary.
First HD youtube upload so enjoy!
I might still be still processing as of this post but should be all good in a few hours time.

First you need to download a copy of SoftTH from the creator’s site here.

Download the latest release which is 1.08b during the time of writing.
After downloading you should end up with a zip file that resembles something like this.

Now place the files into the following directories:
In this case for Left 4 Dead.

Set 1:
SoftTH_hook.dll
SoftTH.cfg

Set 2:
d3d8.dll
d3d9.dll

The files from Set 1 go with the main game executable in:  steamapps > common > left 4 dead
While Set 2 files are to be placed into the ‘bin’ folder:  steamapps > common > left 4 dead > bin
The files if placed properly should look like the ones in the picture below.

Now grab a copy of my config file from here.
Copy, paste my configuration into the config file in your own directory.

You now need to set Left 4 Dead to actually run in your desired screen size.

1. Options > Video
2. Set Aspect Ratio to: Widescreen 16:9 (the game does not recognise the custom aspect ratio so it just puts it there)
3. Set your desired resolution.
4. Set Display Mode to Full Screen (This is important as Windows 7 does not seem to like windowed games being spread across many monitors)

With your settings set, restart the game it might start up and look weird but wait until it has gotten to the menus.

‘Alt-tab’ out and back in, it should fix it.

Now enjoy Left 4 Dead in triple monitor glory.

Just make sure your computer is up to scratch to be able to support three monitors.

The same steps can be applied to Team Fortress 2 to produce the same results.

Edit: I should have put this note in a while back.

Note: I do not guarantee that my config will work 100% with every setup as everyone’s hardware is different, so you may end up having to modify the config file so that it works with your setup.
This config file is designed to be compatible with three monitors that can display a native resolution of 1680×1050 only.
Anything else you must change the resolution settings in the config file to match your hardware otherwise this will not work.

Disclaimer: This information is provided as is and you may use it at your own risk.

Also don’t rip my tutorial if you post this anywhere make sure you give credit.

Update 5/04/2010: I’ve changed the SoftTH config file’s monitor detection to ‘auto’ this should alleviate the need to specify monitors as the hook will automatically detect them for you, though you will still need to run the main screen in the centre screen as per usual.

The results surprised me as it ran on high settings with 2xAA and 2xAF very well.
All the UI elements didn’t look messed up and everything rendered very nicely it was as if the game was made for multi-monitor setups.

The only thing that was messed up by the huge resolution was the main menu’s background.
Otherwise everything was sweet.
Here’s a test run jumped into a random game, in this case the finale of No Mercy.

I used the same config as my Team Fortress 2 attempt, which can be grabbed from here.

After reading this article from Multimonitor.net showing that it was possible to get Team Fortress 2 to run on triple monitors with a program that emulates Matrox’s TripleHead2Go‘s functions – SoftTH.

I decided to give it a shot so after a good two hours of google, trial and error I finally got Team Fortress 2 working on my three Samsung 2243BWs.
It seemed to have a bit of difficulty running on Windows 7 Build 7077 so it took me a bit longer than anticipated.
Check out the test run on my Youtube video below.

You can give SoftTH a shot too, download it from the developer’s site.
Grab my config file from here, just copy paste the code into your config file and it should work.

Update 6/11/2010: The latest Team Fortress 2 update has broken SoftTH 1.08 and 1.09c, a workaround for this is to run TF2 in DirectX 8 with the command “-dxlevel 80″, you’ll lose quality but you can get your game on.