care to elaborate, any one?

You get more rubber on the ground, in technical sections where you depend on
friction you simply have more of it, e.g., rockgardens. On lose muddy trails
you sink down less. Going on wooden plank bridges
http://www.lowdin.nu/Mtbruntuppsala/...nsenled11e.JPG wide tires
makes it less likely that you slip between the planks and get stuck with
your wheel. We have a lot of those where we ride in Sweden so we always use
2.1" tires.
http://www.lowdin.nu/Mtbruntuppsala/.../lunsenl3c.jpg
http://www.lowdin.nu/Mtbruntuppsala/.../lunsenl28.jpg

Per