[batista]

>While most of the article talks about code, the author mentions underscores being ambiguous in the context of underlined fonts. (I don't even think my text editor [for code] supports underlined fonts.)

Lot's of editors do. In Eclipse, for one, it's common to see function names and such shown as hyperlinks when you click on them (with underlines), which makes their definition open (like a function call is "linked" to the function definition).