Let me begin by saying that Simple Meta Tags is exactly what I was looking for. It feels like the most natural extension to WordPress.
I was just wondering (and mostly hoping :)) if you had any intention to make your plugin compatible with WordPress 3.3? I'm not sure about the description and keyword tags but I can tell that the title tags don't seem to work with the latest version of WordPress 3.3. WordPress keeps its default behavior of showing the page's title (not to be confused with the title tag) followed by a pipe and the site's name (ex.: Contact Us | ABC Corp.)
Thanks and happy new year!