Sparkling Clean Glassware & Cutlery.
I know... this may seem like a no-brainer, but it's one of those so simple things that are incredibly important in the whole scheme of things. It's not so much that people will look at your table and think, "Wow, those are sparkling clean glasses and silverware." It's more that if they are not clean and shiny that it will be noticed and noted.
Why spend the time putting together a beautiful meal or gathering, and miss something so simple, yet so effective to enhancing your table.
I worked in the fine dining restaurant business that my family owned for about 10 years. How did we get our glasses and cutlery clean and spotless enough to stand up to a pure white linen napkin? We steamed and polished with a soft, lint free cloth. Seems like a lot of work, but it really goes quickly, and is absolutely worth the time spent.