<p>I think two of the most common ones in your list now, exacerbated by ‘quick messaging’ (texts, email, IM), are the words ‘your’, apparently because it’s just too difficult to spell with two extra characters (you’re), and using ‘loose’ in place of ‘lose’ because the people doing that honestly don’t know the correct spelling (because they consistently misuse it).</p>
<p>The advent of the spell checker is making some people lazy and dependent on it where they don’t even try or learn.</p>