It also depends on other conventions that you're using. At one job, we were programming in Java and the convention was to use long and descriptive identifiers, which meant that only a couple of them could fit on a line without running into the 80-character limit. I thought that was pretty stupid considering every developer in the company was given a widescreen monitor that could easily fit 200 characters. With hardware consistency like that it makes no sense to enforce a stupidly small line wrap limit.
