You know what was awesome about CRTs, no static resolution.
Anyway, i personally don't know anyone with a 16:10 monitor and a 360...but i found this:
http://www.extremetech.com/article2/...1764459,00.asp
and this:
http://digg.com/gaming_news/Beautifu...ades_interface
and, most importantly, this:
http://g-prime.net/x360/1080i-1.JPG
the picture is 1080i though and i'm really too lazy to read any deeper into it, but you should be able to run the 360 on a LCD that sports a 16:10 resolution. and since 16:10 has a higher verticle resolution anyway, wouldn't it just letterbox it?
btw, i like your sig, we'll have to play tfc2 when it comes out