1 vote for widescreen!
I love my widescreen monitor for several reasons.
1. Everybody loves how it looks. When I show pictures to people (from my 6.3 megapixel Canon Digital Rebel), they look GREAT in full screen.
2. It fits perfectly in my carrying case (Targus Hardcase), with my power supply and accessories.
3. Games and movies that I play look great! When I watch other people play UT2004 on standard computer screens, it feels like I can't see anything to the right or left, because the up and down view is so high, and the side-to-side view seems so limited (compared to my widescreen).
4. I agree with the previous comments about full keyboards fitting better on widescreen notebooks.
5. Standard screens just seem so "old style."
-Ransom