If you enable the \"View Right Margin\" in your IDE of choice, it is likely that it will default to 80 characters. I tend to change it to 120 for no reason other than it was th
Maybe the 80 characters is also a good point to avoid these bad getter chains:
object.getFoo().getBar().getFooBar().get ...
if you limit it to 80 characters, maybe someone would localize these variables and do null check etc, but maybe most programmers would let them wrap in the next row. i don't know
Beside that, 80 characters are great as starblue mentioned. This should defenitely goes into the coding standards.