I've brought this up before but Fulgrim's latest post in one of the flamewar threads has reminded me of it again. The forum text column width is punishingly narrow.
Here's an image showing exactly what's wrong with it:
[Edit: Ironically, the image was too wide to show on the super narrow column, so I'll just link to it]
And this is on a normal, standard sized monitor on a standard sized 1680 x 1050 pixel display. On my over sized monitor which does 2560 x 1440, 480 pixels, the column width is only 18.75% of the screen real estate. That's absurd.
The simple solution: Have someone edit the forum files to something like at least 800 pixels. Currently the column width is fixed at 480 pixels - this necessarily means that SOMEWHERE in CSS files there's a number that reflects this, and can be changed. Unless the the forum width is hard coded in a way that is resistant to editing, this should be a five minute procedure.
The more complex solution: Make it dynamic width that extends itself to fit the width of whatever display is being used.