Interesting that thee are still a lot of non widescreen aspect users out there. I prefer 16:10 and 21:9 aspect ratio myself hehe.
widescreen is best used vertically for text and forum browsing.
One issue with widescreen is that I'll be using dual monitors and then it ends up being super wide.
Depending on what you use them for, a single fullscreen "main" monitor flanked by a vertical widescreen monitor could be a great layout.