Punctuation
Perhaps I shouldn’t bring this up, since I recently heard a literary agent railing against the use of ellipses and semicolons (and basically anything but commas and periods), but this article on some lesser-known punctuation marks struck me as useful, since I always like to have as much flexibility as possible. Of course, there is the difficulty of not having keyboards with authority points and the like on them, but some of those lesser-used function keys could pressed into service, I’d think.
More general advice on punctuation can, of course, be found here.
http://www.mentalfloss.com/blogs/archives/144712