The idea of using a grammar checker program for most of us falls under the optional category, but when you think about it this should not be the case. No matter how good we think we are at spelling and grammar, there are always going to be errors. These errors are often tough to find if we are the ones writing the material, because we become “blind” in a way to our own writing.
This is precisely why it is important to check your work, and the easiest way to do this is to use a grammar/spell checker online. For example, services offered by products such as SpellCheckAsYouType (SCAYT) and WebSpellChecker (WSC) provide an easy-to-use, yet free grammar check for people who want to make sure that the material they are putting out is indeed professional and lacking in errors.
This truly separates those who pay attention to the details in their work and those who don’t, and that simple aspect can literally make the difference between giving you a professional image or a bad gut feeling for the reader.