Many homes -- especially older ones -- have awkwardly narrow rooms. Often these are prime places to put your workspace, even if it takes up the entire width of the room, like in the photo above.
Geek Things [Flickr]
Edrei Zahari manages to fit his triple-monitor workspace into a room that's just 61 inches wide. But it looks neat and comfortable enough to work or play in. The lack of clutter and light paint colour on the walls help, along with modifications to the desk to manage (hide) the cables and other accessories.
You can see these desk modifications at his Flickr photostream linked below.